25662631681 has 12 divisors (see below), whose sum is σ = 26435689600. Its totient is φ = 24908067288.

The previous prime is 25662631609. The next prime is 25662631691. The reversal of 25662631681 is 18613626652.

It is not a de Polignac number, because 25662631681 - 2¹³ = 25662623489 is a prime.

It is a super-2 number, since 2×25662631681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25662631691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228340 + ... + 321658.

Almost surely, 2^25662631681 is an apocalyptic number.

It is an amenable number.

25662631681 is a deficient number, since it is larger than the sum of its proper divisors (773057919).

25662631681 is an frugal number, since it uses more digits than its factorization.

25662631681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93516 (or 93457 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The spelling of 25662631681 in words is "twenty-five billion, six hundred sixty-two million, six hundred thirty-one thousand, six hundred eighty-one".