13626640665 has 48 divisors (see below), whose sum is σ = 26627664000. Its totient is φ = 6606848160.

The previous prime is 13626640639. The next prime is 13626640673. The reversal of 13626640665 is 56604662631.

13626640665 is a `hidden beast` number, since 13 + 626 + 6 + 4 + 0 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 13626640665 - 2⁵ = 13626640633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 13626640665.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 400765 + ... + 433434.

It is an arithmetic number, because the mean of its divisors is an integer number (554743000).

Almost surely, 2^13626640665 is an apocalyptic number.

13626640665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13626640665 is a deficient number, since it is larger than the sum of its proper divisors (13001023335).

13626640665 is a wasteful number, since it uses less digits than its factorization.

13626640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834235 (or 834218 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 13626640665 in words is "thirteen billion, six hundred twenty-six million, six hundred forty thousand, six hundred sixty-five".