16687157638 has 8 divisors (see below), whose sum is σ = 25134599160. Its totient is φ = 8308957920.

The previous prime is 16687157633. The next prime is 16687157647. The reversal of 16687157638 is 83675178661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16687157638² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16687157633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17309848 + ... + 17310811.

It is an arithmetic number, because the mean of its divisors is an integer number (3141824895).

Almost surely, 2^16687157638 is an apocalyptic number.

16687157638 is a deficient number, since it is larger than the sum of its proper divisors (8447441522).

16687157638 is a wasteful number, since it uses less digits than its factorization.

16687157638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34620902.

The product of its digits is 10160640, while the sum is 58.

The spelling of 16687157638 in words is "sixteen billion, six hundred eighty-seven million, one hundred fifty-seven thousand, six hundred thirty-eight".