100664865 has 72 divisors (see below), whose sum is σ = 206152128. Its totient is φ = 45299520.

The previous prime is 100664857. The next prime is 100664873. The reversal of 100664865 is 568466001.

100664865 is a `hidden beast` number, since 1 + 0 + 0 + 6 + 648 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (100664857) and next prime (100664873).

It is not a de Polignac number, because 100664865 - 2³ = 100664857 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 156234 + ... + 156876.

It is an arithmetic number, because the mean of its divisors is an integer number (2863224).

Almost surely, 2^100664865 is an apocalyptic number.

100664865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

100664865 is an abundant number, since it is smaller than the sum of its proper divisors (105487263).

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

100664865 is a wasteful number, since it uses less digits than its factorization.

100664865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739 (or 729 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 100664865 is about 10033.1881772446. The cubic root of 100664865 is about 465.1852886279.

The spelling of 100664865 in words is "one hundred million, six hundred sixty-four thousand, eight hundred sixty-five".