15155752655521 has 9 divisors (see below), whose sum is σ = 15172117170483. Its totient is φ = 15139405784760.

The previous prime is 15155752655501. The next prime is 15155752655557. The reversal of 15155752655521 is 12555625755151.

The square root of 15155752655521 is 3893039.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 6887942511121 + 8267810144400 = 2624489^2 + 2875380^2 .

It is not a de Polignac number, because 15155752655521 - 2¹⁷ = 15155752524449 is a prime.

It is a Duffinian number.

Its product of digits (13125000) is a multiple of the sum of its prime divisors (4200).

It is not an unprimeable number, because it can be changed into a prime (15155752655501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5376285450 + ... + 5376288268.

Almost surely, 2^{15155752655521} is an apocalyptic number.

15155752655521 is the 3893039-th square number.

15155752655521 is the 1946520-th centered octagonal number.

It is an amenable number.

15155752655521 is a deficient number, since it is larger than the sum of its proper divisors (16364514962).

15155752655521 is an frugal number, since it uses more digits than its factorization.

15155752655521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400 (or 4200 counting only the distinct ones).

The product of its digits is 13125000, while the sum is 55.

The spelling of 15155752655521 in words is "fifteen trillion, one hundred fifty-five billion, seven hundred fifty-two million, six hundred fifty-five thousand, five hundred twenty-one".