13387528665 has 128 divisors (see below), whose sum is σ = 27599892480. Its totient is φ = 6030775296.

The previous prime is 13387528613. The next prime is 13387528681. The reversal of 13387528665 is 56682578331.

13387528665 is a `hidden beast` number, since 1 + 33 + 87 + 528 + 6 + 6 + 5 = 666.

It is not a de Polignac number, because 13387528665 - 2⁹ = 13387528153 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 30219934 + ... + 30220376.

It is an arithmetic number, because the mean of its divisors is an integer number (215624160).

Almost surely, 2^13387528665 is an apocalyptic number.

13387528665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13387528665 is an abundant number, since it is smaller than the sum of its proper divisors (14212363815).

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

13387528665 is a wasteful number, since it uses less digits than its factorization.

13387528665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 854 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The spelling of 13387528665 in words is "thirteen billion, three hundred eighty-seven million, five hundred twenty-eight thousand, six hundred sixty-five".