15389643025 has 27 divisors (see below), whose sum is σ = 19571191281. Its totient is φ = 12004554240.

The previous prime is 15389642987. The next prime is 15389643029. The reversal of 15389643025 is 52034698351.

The square root of 15389643025 is 124055.

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 4345314561 + 11044328464 = 65919^2 + 105092^2 .

It is a de Polignac number, because none of the positive numbers 2^k-15389643025 is a prime.

It is a super-2 number, since 2×15389643025² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15389643029) 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, 26671537 + ... + 26672113.

Almost surely, 2^15389643025 is an apocalyptic number.

15389643025 is the 124055-th square number.

15389643025 is the 62028-th centered octagonal number.

It is an amenable number.

15389643025 is a deficient number, since it is larger than the sum of its proper divisors (4181548256).

15389643025 is an frugal number, since it uses more digits than its factorization.

15389643025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 15389643025 in words is "fifteen billion, three hundred eighty-nine million, six hundred forty-three thousand, twenty-five".