15551157121564 has 48 divisors (see below), whose sum is σ = 27320833397088. Its totient is φ = 7745275219968.

The previous prime is 15551157121529. The next prime is 15551157121571. The reversal of 15551157121564 is 46512175115551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3569232874 + ... + 3569237230.

It is an arithmetic number, because the mean of its divisors is an integer number (569184029106).

Almost surely, 2^{15551157121564} is an apocalyptic number.

It is an amenable number.

15551157121564 is a deficient number, since it is larger than the sum of its proper divisors (11769676275524).

15551157121564 is a wasteful number, since it uses less digits than its factorization.

15551157121564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7654 (or 7652 counting only the distinct ones).

The product of its digits is 1050000, while the sum is 49.

The spelling of 15551157121564 in words is "fifteen trillion, five hundred fifty-one billion, one hundred fifty-seven million, one hundred twenty-one thousand, five hundred sixty-four".