161858705556234 has 32 divisors (see below), whose sum is σ = 326104676244864. Its totient is φ = 53556484432640.

The previous prime is 161858705556187. The next prime is 161858705556241. The reversal of 161858705556234 is 432655507858161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 182069139 + ... + 182955974.

It is an arithmetic number, because the mean of its divisors is an integer number (10190771132652).

Almost surely, 2^{161858705556234} is an apocalyptic number.

161858705556234 is an abundant number, since it is smaller than the sum of its proper divisors (164245970688630).

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

161858705556234 is a wasteful number, since it uses less digits than its factorization.

161858705556234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365025662.

The product of its (nonzero) digits is 241920000, while the sum is 66.

The spelling of 161858705556234 in words is "one hundred sixty-one trillion, eight hundred fifty-eight billion, seven hundred five million, five hundred fifty-six thousand, two hundred thirty-four".