15664511655 has 48 divisors (see below), whose sum is σ = 29256645600. Its totient is φ = 7707481344.

The previous prime is 15664511647. The next prime is 15664511669. The reversal of 15664511655 is 55611546651.

15664511655 is a `hidden beast` number, since 15 + 6 + 64 + 511 + 65 + 5 = 666.

It is not a de Polignac number, because 15664511655 - 2³ = 15664511647 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 15664511655.

It is a congruent number.

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, 1221537 + ... + 1234293.

It is an arithmetic number, because the mean of its divisors is an integer number (609513450).

Almost surely, 2^15664511655 is an apocalyptic number.

15664511655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15664511655 is a deficient number, since it is larger than the sum of its proper divisors (13592133945).

15664511655 is a wasteful number, since it uses less digits than its factorization.

15664511655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14880 (or 14877 counting only the distinct ones).

The product of its digits is 540000, while the sum is 45.

The spelling of 15664511655 in words is "fifteen billion, six hundred sixty-four million, five hundred eleven thousand, six hundred fifty-five".