25591360729 has 9 divisors (see below), whose sum is σ = 28131281269. Its totient is φ = 23263273660.

The previous prime is 25591360723. The next prime is 25591360733. The reversal of 25591360729 is 92706319552.

The square root of 25591360729 is 159973.

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

It is not a de Polignac number, because 25591360729 - 2³ = 25591360721 is a prime.

It is a super-2 number, since 2×25591360729² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25591360721) 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, 1752432 + ... + 1766974.

Almost surely, 2^25591360729 is an apocalyptic number.

25591360729 is the 159973-rd square number.

25591360729 is the 79987-th centered octagonal number.

It is an amenable number.

25591360729 is a deficient number, since it is larger than the sum of its proper divisors (2539920540).

25591360729 is an frugal number, since it uses more digits than its factorization.

25591360729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29108 (or 14554 counting only the distinct ones).

The product of its (nonzero) digits is 1020600, while the sum is 49.

Multiplying 25591360729 by its sum of digits (49), we get a square (1253976675721 = 1119811²).

The spelling of 25591360729 in words is "twenty-five billion, five hundred ninety-one million, three hundred sixty thousand, seven hundred twenty-nine".