168638207715 has 32 divisors (see below), whose sum is σ = 299833228800. Its totient is φ = 89930786400.

The previous prime is 168638207711. The next prime is 168638207723. The reversal of 168638207715 is 517702836861.

It is a happy number.

It is not a de Polignac number, because 168638207715 - 2² = 168638207711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (168638207711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1308856 + ... + 1431914.

It is an arithmetic number, because the mean of its divisors is an integer number (9369788400).

Almost surely, 2^168638207715 is an apocalyptic number.

168638207715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

168638207715 is a deficient number, since it is larger than the sum of its proper divisors (131195021085).

168638207715 is a wasteful number, since it uses less digits than its factorization.

168638207715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133224 (or 133218 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 168638207715 in words is "one hundred sixty-eight billion, six hundred thirty-eight million, two hundred seven thousand, seven hundred fifteen".