25685724791 has 16 divisors (see below), whose sum is σ = 26420701824. Its totient is φ = 24957358944.

The previous prime is 25685724781. The next prime is 25685724853. The reversal of 25685724791 is 19742758652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25685724791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25685724781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7672580 + ... + 7675926.

It is an arithmetic number, because the mean of its divisors is an integer number (1651293864).

Almost surely, 2^25685724791 is an apocalyptic number.

25685724791 is a deficient number, since it is larger than the sum of its proper divisors (734977033).

25685724791 is a wasteful number, since it uses less digits than its factorization.

25685724791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4270.

The product of its digits is 8467200, while the sum is 56.

The spelling of 25685724791 in words is "twenty-five billion, six hundred eighty-five million, seven hundred twenty-four thousand, seven hundred ninety-one".