25971256336 has 15 divisors (see below), whose sum is σ = 50320558141. Its totient is φ = 12985305856.

The previous prime is 25971256321. The next prime is 25971256387. The reversal of 25971256336 is 63365217952.

The square root of 25971256336 is 161156.

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., 25231416336 + 739840000 = 158844^2 + 27200^2 .

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 25971256336.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 624480 + ... + 664768.

Almost surely, 2^25971256336 is an apocalyptic number.

25971256336 is the 161156-th square number.

It is an amenable number.

25971256336 is a deficient number, since it is larger than the sum of its proper divisors (24349301805).

25971256336 is an frugal number, since it uses more digits than its factorization.

25971256336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80586 (or 40291 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 49.

Multiplying 25971256336 by its sum of digits (49), we get a square (1272591560464 = 1128092²).

The spelling of 25971256336 in words is "twenty-five billion, nine hundred seventy-one million, two hundred fifty-six thousand, three hundred thirty-six".