161109248661 has 6 divisors (see below), whose sum is σ = 232713359190. Its totient is φ = 107406165768.

The previous prime is 161109248639. The next prime is 161109248687. The reversal of 161109248661 is 166842901161.

161109248661 is a `hidden beast` number, since 1 + 6 + 1 + 109 + 2 + 486 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 110693282436 + 50415966225 = 332706^2 + 224535^2 .

It is not a de Polignac number, because 161109248661 - 2⁷ = 161109248533 is a prime.

It is a super-2 number, since 2×161109248661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161109248561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8950513806 + ... + 8950513823.

It is an arithmetic number, because the mean of its divisors is an integer number (38785559865).

Almost surely, 2^161109248661 is an apocalyptic number.

It is an amenable number.

161109248661 is a deficient number, since it is larger than the sum of its proper divisors (71604110529).

161109248661 is a wasteful number, since it uses less digits than its factorization.

161109248661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17901027635 (or 17901027632 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 161109248661 in words is "one hundred sixty-one billion, one hundred nine million, two hundred forty-eight thousand, six hundred sixty-one".