25720243679 has 12 divisors (see below), whose sum is σ = 28307498472. Its totient is φ = 23352544800.

The previous prime is 25720243673. The next prime is 25720243727. The reversal of 25720243679 is 97634202752.

It is not a de Polignac number, because 25720243679 - 2¹² = 25720239583 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25720243673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1237157 + ... + 1257774.

It is an arithmetic number, because the mean of its divisors is an integer number (2358958206).

Almost surely, 2^25720243679 is an apocalyptic number.

25720243679 is a deficient number, since it is larger than the sum of its proper divisors (2587254793).

25720243679 is a wasteful number, since it uses less digits than its factorization.

25720243679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495018 (or 2495005 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 47.

The spelling of 25720243679 in words is "twenty-five billion, seven hundred twenty million, two hundred forty-three thousand, six hundred seventy-nine".