161171667620 has 24 divisors (see below), whose sum is σ = 344197123200. Its totient is φ = 63375977312.

The previous prime is 161171667571. The next prime is 161171667637. The reversal of 161171667620 is 26766171161.

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 7 ways as a sum of consecutive naturals, for example, 68291900 + ... + 68294259.

It is an arithmetic number, because the mean of its divisors is an integer number (14341546800).

Almost surely, 2^161171667620 is an apocalyptic number.

161171667620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161171667620 is an abundant number, since it is smaller than the sum of its proper divisors (183025455580).

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

161171667620 is a wasteful number, since it uses less digits than its factorization.

161171667620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136586227 (or 136586225 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 161171667620 in words is "one hundred sixty-one billion, one hundred seventy-one million, six hundred sixty-seven thousand, six hundred twenty".