15513887655 has 48 divisors (see below), whose sum is σ = 31447004160. Its totient is φ = 6927125184.

The previous prime is 15513887629. The next prime is 15513887663. The reversal of 15513887655 is 55678831551.

15513887655 is a `hidden beast` number, since 1 + 5 + 513 + 8 + 8 + 76 + 55 = 666.

It is not a de Polignac number, because 15513887655 - 2⁸ = 15513887399 is a prime.

It is a super-2 number, since 2×15513887655² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 559135 + ... + 586224.

It is an arithmetic number, because the mean of its divisors is an integer number (655145920).

Almost surely, 2^15513887655 is an apocalyptic number.

15513887655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15513887655 is an abundant number, since it is smaller than the sum of its proper divisors (15933116505).

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

15513887655 is a wasteful number, since it uses less digits than its factorization.

15513887655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145420 (or 1145417 counting only the distinct ones).

The product of its digits is 5040000, while the sum is 54.

The spelling of 15513887655 in words is "fifteen billion, five hundred thirteen million, eight hundred eighty-seven thousand, six hundred fifty-five".