161026555554 has 16 divisors (see below), whose sum is σ = 357836790240. Its totient is φ = 53675518500.

The previous prime is 161026555537. The next prime is 161026555567. The reversal of 161026555554 is 455555620161.

It is a happy number.

161026555554 is a `hidden beast` number, since 1 + 610 + 26 + 5 + 5 + 5 + 5 + 5 + 4 = 666.

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 7 ways as a sum of consecutive naturals, for example, 1490986572 + ... + 1490986679.

It is an arithmetic number, because the mean of its divisors is an integer number (22364799390).

Almost surely, 2^161026555554 is an apocalyptic number.

161026555554 is an abundant number, since it is smaller than the sum of its proper divisors (196810234686).

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

161026555554 is a wasteful number, since it uses less digits than its factorization.

161026555554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981973262 (or 2981973256 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 45.

The spelling of 161026555554 in words is "one hundred sixty-one billion, twenty-six million, five hundred fifty-five thousand, five hundred fifty-four".