161558452656 has 30 divisors (see below), whose sum is σ = 452139281100. Its totient is φ = 53852817504.

The previous prime is 161558452639. The next prime is 161558452669. The reversal of 161558452656 is 656254855161.

161558452656 is a `hidden beast` number, since 1 + 6 + 1 + 5 + 584 + 5 + 2 + 6 + 56 = 666.

It is a super-2 number, since 2×161558452656² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 560966706 + ... + 560966993.

It is an arithmetic number, because the mean of its divisors is an integer number (15071309370).

Almost surely, 2^161558452656 is an apocalyptic number.

161558452656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161558452656 is an abundant number, since it is smaller than the sum of its proper divisors (290580828444).

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

161558452656 is a wasteful number, since it uses less digits than its factorization.

161558452656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121933713 (or 1121933704 counting only the distinct ones).

The product of its digits is 8640000, while the sum is 54.

The spelling of 161558452656 in words is "one hundred sixty-one billion, five hundred fifty-eight million, four hundred fifty-two thousand, six hundred fifty-six".