25991764384 has 12 divisors (see below), whose sum is σ = 51171286194. Its totient is φ = 12995882176.

The previous prime is 25991764367. The next prime is 25991764411. The reversal of 25991764384 is 48346719952.

It can be written as a sum of positive squares in only one way, i.e., 16235856400 + 9755907984 = 127420^2 + 98772^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406121287 + ... + 406121350.

Almost surely, 2^25991764384 is an apocalyptic number.

It is an amenable number.

25991764384 is a deficient number, since it is larger than the sum of its proper divisors (25179521810).

25991764384 is an equidigital number, since it uses as much as digits as its factorization.

25991764384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812242647 (or 812242639 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 58.

The spelling of 25991764384 in words is "twenty-five billion, nine hundred ninety-one million, seven hundred sixty-four thousand, three hundred eighty-four".