816616615507 has 16 divisors (see below), whose sum is σ = 1042951601664. Its totient is φ = 620804520000.

The previous prime is 816616615499. The next prime is 816616615513. The reversal of 816616615507 is 705516616618.

It is a happy number.

It is not a de Polignac number, because 816616615507 - 2³ = 816616615499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816616615537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129331119 + ... + 129337432.

It is an arithmetic number, because the mean of its divisors is an integer number (65184475104).

Almost surely, 2^816616615507 is an apocalyptic number.

816616615507 is a deficient number, since it is larger than the sum of its proper divisors (226334986157).

816616615507 is a wasteful number, since it uses less digits than its factorization.

816616615507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258668610.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The spelling of 816616615507 in words is "eight hundred sixteen billion, six hundred sixteen million, six hundred fifteen thousand, five hundred seven".