161312057855 has 32 divisors (see below), whose sum is σ = 210414443904. Its totient is φ = 118009737216.

The previous prime is 161312057807. The next prime is 161312057861. The reversal of 161312057855 is 558750213161.

It is a cyclic number.

It is not a de Polignac number, because 161312057855 - 2¹² = 161312053759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19438067 + ... + 19446363.

It is an arithmetic number, because the mean of its divisors is an integer number (6575451372).

Almost surely, 2^161312057855 is an apocalyptic number.

161312057855 is a deficient number, since it is larger than the sum of its proper divisors (49102386049).

161312057855 is a wasteful number, since it uses less digits than its factorization.

161312057855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11075.

The product of its (nonzero) digits is 252000, while the sum is 44.

The spelling of 161312057855 in words is "one hundred sixty-one billion, three hundred twelve million, fifty-seven thousand, eight hundred fifty-five".