16157777864 has 16 divisors (see below), whose sum is σ = 30314547420. Its totient is φ = 8073898560.

The previous prime is 16157777843. The next prime is 16157777893. The reversal of 16157777864 is 46877775161.

It can be written as a sum of positive squares in 2 ways, for example, as 15991625764 + 166152100 = 126458^2 + 12890^2 .

It is a super-2 number, since 2×16157777864² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 610019 + ... + 635954.

Almost surely, 2^16157777864 is an apocalyptic number.

It is an amenable number.

16157777864 is a deficient number, since it is larger than the sum of its proper divisors (14156769556).

16157777864 is a wasteful number, since it uses less digits than its factorization.

16157777864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247600 (or 1247596 counting only the distinct ones).

The product of its digits is 13829760, while the sum is 59.

The spelling of 16157777864 in words is "sixteen billion, one hundred fifty-seven million, seven hundred seventy-seven thousand, eight hundred sixty-four".