161786232138 has 64 divisors (see below), whose sum is σ = 339085211904. Its totient is φ = 51363840000.

The previous prime is 161786232089. The next prime is 161786232163. The reversal of 161786232138 is 831232687161.

It is a Curzon 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, 35469378 + ... + 35473938.

It is an arithmetic number, because the mean of its divisors is an integer number (5298206436).

Almost surely, 2^161786232138 is an apocalyptic number.

161786232138 is an abundant number, since it is smaller than the sum of its proper divisors (177298979766).

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

161786232138 is a wasteful number, since it uses less digits than its factorization.

161786232138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5631.

The product of its digits is 580608, while the sum is 48.

The spelling of 161786232138 in words is "one hundred sixty-one billion, seven hundred eighty-six million, two hundred thirty-two thousand, one hundred thirty-eight".