16807231557 has 12 divisors (see below), whose sum is σ = 24869237484. Its totient is φ = 10931532480.

The previous prime is 16807231523. The next prime is 16807231589. The reversal of 16807231557 is 75513270861.

It is a happy number.

16807231557 is a `hidden beast` number, since 1 + 68 + 0 + 7 + 2 + 31 + 557 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6071370561 + 10735860996 = 77919^2 + 103614^2 .

It is not a de Polignac number, because 16807231557 - 2⁷ = 16807231429 is a prime.

It is a super-2 number, since 2×16807231557² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16807231657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22773658 + ... + 22774395.

It is an arithmetic number, because the mean of its divisors is an integer number (2072436457).

Almost surely, 2^16807231557 is an apocalyptic number.

It is an amenable number.

16807231557 is a deficient number, since it is larger than the sum of its proper divisors (8062005927).

16807231557 is a wasteful number, since it uses less digits than its factorization.

16807231557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45548100 (or 45548097 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 16807231557 in words is "sixteen billion, eight hundred seven million, two hundred thirty-one thousand, five hundred fifty-seven".