25491693239 has 12 divisors (see below), whose sum is σ = 27215550000. Its totient is φ = 23871564288.

The previous prime is 25491693209. The next prime is 25491693257. The reversal of 25491693239 is 93239619452.

It is not a de Polignac number, because 25491693239 - 2²⁴ = 25474916023 is a prime.

It is a super-2 number, since 2×25491693239² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25491693209) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 164114 + ... + 279135.

It is an arithmetic number, because the mean of its divisors is an integer number (2267962500).

Almost surely, 2^25491693239 is an apocalyptic number.

25491693239 is a deficient number, since it is larger than the sum of its proper divisors (1723856761).

25491693239 is a wasteful number, since it uses less digits than its factorization.

25491693239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443482 (or 443465 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 53.

The spelling of 25491693239 in words is "twenty-five billion, four hundred ninety-one million, six hundred ninety-three thousand, two hundred thirty-nine".