816662979 has 64 divisors (see below), whose sum is σ = 1355558400. Its totient is φ = 487788480.

The previous prime is 816662971. The next prime is 816662993. The reversal of 816662979 is 979266618.

It is not a de Polignac number, because 816662979 - 2³ = 816662971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816662971) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1996527 + ... + 1996935.

It is an arithmetic number, because the mean of its divisors is an integer number (21180600).

Almost surely, 2^816662979 is an apocalyptic number.

816662979 is a deficient number, since it is larger than the sum of its proper divisors (538895421).

816662979 is an equidigital number, since it uses as much as digits as its factorization.

816662979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 506 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 816662979 is about 28577.3158116713. The cubic root of 816662979 is about 934.7187536191.

The spelling of 816662979 in words is "eight hundred sixteen million, six hundred sixty-two thousand, nine hundred seventy-nine".