15505560551 has 12 divisors (see below), whose sum is σ = 16793650872. Its totient is φ = 14309751456.

The previous prime is 15505560493. The next prime is 15505560557. The reversal of 15505560551 is 15506550551.

It is a happy number.

It is not a de Polignac number, because 15505560551 - 2⁶ = 15505560487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15505560557) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1269365 + ... + 1281521.

It is an arithmetic number, because the mean of its divisors is an integer number (1399470906).

Almost surely, 2^15505560551 is an apocalyptic number.

15505560551 is a deficient number, since it is larger than the sum of its proper divisors (1288090321).

15505560551 is a wasteful number, since it uses less digits than its factorization.

15505560551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19730 (or 19717 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 15505560551 in words is "fifteen billion, five hundred five million, five hundred sixty thousand, five hundred fifty-one".