161649322704 has 320 divisors, whose sum is σ = 489311539200. Its totient is φ = 51023347200.

The previous prime is 161649322699. The next prime is 161649322727. The reversal of 161649322704 is 407223946161.

161649322704 is a `hidden beast` number, since 1 + 616 + 4 + 9 + 3 + 2 + 27 + 0 + 4 = 666.

It is a super-2 number, since 2×161649322704² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161649322704.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 233934999 + ... + 233935689.

It is an arithmetic number, because the mean of its divisors is an integer number (1529098560).

Almost surely, 2^161649322704 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161649322704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244655769600).

161649322704 is an abundant number, since it is smaller than the sum of its proper divisors (327662216496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161649322704 is a wasteful number, since it uses less digits than its factorization.

161649322704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 161649322704 in words is "one hundred sixty-one billion, six hundred forty-nine million, three hundred twenty-two thousand, seven hundred four".