24997191025 has 27 divisors (see below), whose sum is σ = 31402663371. Its totient is φ = 19739093040.

The previous prime is 24997191019. The next prime is 24997191049. The reversal of 24997191025 is 52019179942.

The square root of 24997191025 is 158105.

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., 8998988769 + 15998202256 = 94863^2 + 126484^2 .

It is a de Polignac number, because none of the positive numbers 2^k-24997191025 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 24997191025.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 81423922 + ... + 81424228.

Almost surely, 2^24997191025 is an apocalyptic number.

24997191025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

24997191025 is the 158105-th square number.

24997191025 is the 79053-rd centered octagonal number.

It is an amenable number.

24997191025 is a deficient number, since it is larger than the sum of its proper divisors (6405472346).

24997191025 is an frugal number, since it uses more digits than its factorization.

24997191025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 49.

Multiplying 24997191025 by its sum of digits (49), we get a square (1224862360225 = 1106735²).

The spelling of 24997191025 in words is "twenty-four billion, nine hundred ninety-seven million, one hundred ninety-one thousand, twenty-five".