25897499329 has 9 divisors (see below), whose sum is σ = 28045119843. Its totient is φ = 23903452872.

The previous prime is 25897499297. The next prime is 25897499357. The reversal of 25897499329 is 92399479852.

The square root of 25897499329 is 160927.

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

It can be written as a sum of positive squares in only one way, i.e., 3830991025 + 22066508304 = 61895^2 + 148548^2 .

It is not a de Polignac number, because 25897499329 - 2⁵ = 25897499297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25892499329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2085862 + ... + 2098240.

It is an arithmetic number, because the mean of its divisors is an integer number (3116124427).

Almost surely, 2^25897499329 is an apocalyptic number.

25897499329 is the 160927-th square number.

25897499329 is the 80464-th centered octagonal number.

It is an amenable number.

25897499329 is a deficient number, since it is larger than the sum of its proper divisors (2147620514).

25897499329 is an frugal number, since it uses more digits than its factorization.

25897499329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24784 (or 12392 counting only the distinct ones).

The product of its digits is 88179840, while the sum is 67.

The spelling of 25897499329 in words is "twenty-five billion, eight hundred ninety-seven million, four hundred ninety-nine thousand, three hundred twenty-nine".