15665655555 has 40 divisors (see below), whose sum is σ = 30635068464. Its totient is φ = 7595467200.

The previous prime is 15665655547. The next prime is 15665655569. The reversal of 15665655555 is 55555656651.

15665655555 is a `hidden beast` number, since 15 + 66 + 565 + 5 + 5 + 5 + 5 = 666.

It is not a de Polignac number, because 15665655555 - 2³ = 15665655547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1753756 + ... + 1762665.

Almost surely, 2^15665655555 is an apocalyptic number.

15665655555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15665655555 is a deficient number, since it is larger than the sum of its proper divisors (14969412909).

15665655555 is a wasteful number, since it uses less digits than its factorization.

15665655555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3516449 (or 3516440 counting only the distinct ones).

The product of its digits is 16875000, while the sum is 54.

The spelling of 15665655555 in words is "fifteen billion, six hundred sixty-five million, six hundred fifty-five thousand, five hundred fifty-five".