15511457025 has 135 divisors (see below), whose sum is σ = 30656706899. Its totient is φ = 7496612640.

The previous prime is 15511456963. The next prime is 15511457029. The reversal of 15511457025 is 52075411551.

The square root of 15511457025 is 124545.

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

15511457025 is a `hidden beast` number, since 1 + 5 + 51 + 14 + 570 + 25 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5584124529 + 9927332496 = 74727^2 + 99636^2 .

It is not a de Polignac number, because 15511457025 - 2¹³ = 15511448833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15511457029) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 674411164 + ... + 674411186.

Almost surely, 2^15511457025 is an apocalyptic number.

15511457025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15511457025 is the 124545-th square number.

15511457025 is the 62273-rd centered octagonal number.

It is an amenable number.

15511457025 is a deficient number, since it is larger than the sum of its proper divisors (15145249874).

15511457025 is an frugal number, since it uses more digits than its factorization.

15511457025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 50 counting only the distinct ones).

The product of its (nonzero) digits is 35000, while the sum is 36.

Multiplying 15511457025 by its sum of digits (36), we get a square (558412452900 = 747270²).

Adding to 15511457025 its reverse (52075411551), we get a palindrome (67586868576).

The spelling of 15511457025 in words is "fifteen billion, five hundred eleven million, four hundred fifty-seven thousand, twenty-five".