15501495025 has 27 divisors (see below), whose sum is σ = 19784802051. Its totient is φ = 12048099840.

The previous prime is 15501494909. The next prime is 15501495029. The reversal of 15501495025 is 52059410551.

It is a happy number.

The square root of 15501495025 is 124505.

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

It can be written as a sum of positive squares in 13 ways, for example, as 5656092849 + 9845402176 = 75207^2 + 99224^2 .

It is not a de Polignac number, because 15501495025 - 2⁹ = 15501494513 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15501495029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23033089 + ... + 23033761.

Almost surely, 2^15501495025 is an apocalyptic number.

15501495025 is the 124505-th square number.

15501495025 is the 62253-rd centered octagonal number.

It is an amenable number.

15501495025 is a deficient number, since it is larger than the sum of its proper divisors (4283307026).

15501495025 is an frugal number, since it uses more digits than its factorization.

15501495025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1430 (or 715 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 15501495025 in words is "fifteen billion, five hundred one million, four hundred ninety-five thousand, twenty-five".