161715494878 has 32 divisors (see below), whose sum is σ = 282921681600. Its totient is φ = 69297469920.

The previous prime is 161715494849. The next prime is 161715494881. The reversal of 161715494878 is 878494517161.

It is a congruent number.

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, 8807988 + ... + 8826328.

It is an arithmetic number, because the mean of its divisors is an integer number (8841302550).

Almost surely, 2^161715494878 is an apocalyptic number.

161715494878 is a deficient number, since it is larger than the sum of its proper divisors (121206186722).

161715494878 is a wasteful number, since it uses less digits than its factorization.

161715494878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31217 (or 31203 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 61.

The spelling of 161715494878 in words is "one hundred sixty-one billion, seven hundred fifteen million, four hundred ninety-four thousand, eight hundred seventy-eight".