816631656 has 32 divisors (see below), whose sum is σ = 2042852640. Its totient is φ = 272040768.

The previous prime is 816631649. The next prime is 816631663. The reversal of 816631656 is 656136618.

816631656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (816631649) and next prime (816631663).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32190 + ... + 51666.

It is an arithmetic number, because the mean of its divisors is an integer number (63839145).

Almost surely, 2^816631656 is an apocalyptic number.

It is an amenable number.

816631656 is an abundant number, since it is smaller than the sum of its proper divisors (1226220984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816631656 is a wasteful number, since it uses less digits than its factorization.

816631656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21233 (or 21229 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 816631656 is about 28576.7677668417. The cubic root of 816631656 is about 934.7068031285.

The spelling of 816631656 in words is "eight hundred sixteen million, six hundred thirty-one thousand, six hundred fifty-six".