15513948025 has 27 divisors (see below), whose sum is σ = 19946745741. Its totient is φ = 11969237280.

The previous prime is 15513947959. The next prime is 15513948029. The reversal of 15513948025 is 52084931551.

The square root of 15513948025 is 124555.

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

It can be written as a sum of positive squares in 4 ways, for example, as 213247609 + 15300700416 = 14603^2 + 123696^2 .

It is not a de Polignac number, because 15513948025 - 2²¹ = 15511850873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15513948029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18060046 + ... + 18060904.

Almost surely, 2^15513948025 is an apocalyptic number.

15513948025 is the 124555-th square number.

15513948025 is the 62278-th centered octagonal number.

It is an amenable number.

15513948025 is a deficient number, since it is larger than the sum of its proper divisors (4432797716).

15513948025 is an frugal number, since it uses more digits than its factorization.

15513948025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 15513948025 in words is "fifteen billion, five hundred thirteen million, nine hundred forty-eight thousand, twenty-five".