161123519662506 has 64 divisors (see below), whose sum is σ = 358292564922240. Its totient is φ = 53671800752640.

The previous prime is 161123519662477. The next prime is 161123519662541. The reversal of 161123519662506 is 605266915321161.

161123519662506 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 2 + 3 + 5 + 1 + 9 + 6 + 625 + 0 + 6 = 666.

It is a super-2 number, since 2×161123519662506² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1110197626 + ... + 1110342746.

It is an arithmetic number, because the mean of its divisors is an integer number (5598321326910).

Almost surely, 2^{161123519662506} is an apocalyptic number.

161123519662506 is an abundant number, since it is smaller than the sum of its proper divisors (197169045259734).

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

161123519662506 is a wasteful number, since it uses less digits than its factorization.

161123519662506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158788 (or 158782 counting only the distinct ones).

The product of its (nonzero) digits is 3499200, while the sum is 54.

The spelling of 161123519662506 in words is "one hundred sixty-one trillion, one hundred twenty-three billion, five hundred nineteen million, six hundred sixty-two thousand, five hundred six".