816882666509 has 32 divisors (see below), whose sum is σ = 1007056882944. Its totient is φ = 645256834560.

The previous prime is 816882666497. The next prime is 816882666511. The reversal of 816882666509 is 905666288618.

It is not a de Polignac number, because 816882666509 - 2³² = 812587699213 is a prime.

It is a super-2 number, since 2×816882666509² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816882666569) 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, 186799247 + ... + 186803619.

It is an arithmetic number, because the mean of its divisors is an integer number (31470527592).

Almost surely, 2^816882666509 is an apocalyptic number.

It is an amenable number.

816882666509 is a deficient number, since it is larger than the sum of its proper divisors (190174216435).

816882666509 is a wasteful number, since it uses less digits than its factorization.

816882666509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7317.

The product of its (nonzero) digits is 59719680, while the sum is 65.

The spelling of 816882666509 in words is "eight hundred sixteen billion, eight hundred eighty-two million, six hundred sixty-six thousand, five hundred nine".