15521012551 has 6 divisors (see below), whose sum is σ = 17060286656. Its totient is φ = 14110011300.

The previous prime is 15521012471. The next prime is 15521012557.

15521012551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 15521012551 - 2¹⁵ = 15520979783 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 (15521012557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64136295 + ... + 64136536.

Almost surely, 2^15521012551 is an apocalyptic number.

15521012551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

15521012551 is a deficient number, since it is larger than the sum of its proper divisors (1539274105).

15521012551 is a wasteful number, since it uses less digits than its factorization.

15521012551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128272853 (or 128272842 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 28.

It can be divided in two parts, 155210 and 12551, that added together give a palindrome (167761).

The spelling of 15521012551 in words is "fifteen billion, five hundred twenty-one million, twelve thousand, five hundred fifty-one".