25426527681 has 16 divisors (see below), whose sum is σ = 36116317440. Its totient is φ = 15865376400.

The previous prime is 25426527677. The next prime is 25426527689. The reversal of 25426527681 is 18672562452.

It is not a de Polignac number, because 25426527681 - 2² = 25426527677 is a prime.

It is a super-2 number, since 2×25426527681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25426527681.

It is not an unprimeable number, because it can be changed into a prime (25426527689) 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, 2682495 + ... + 2691956.

It is an arithmetic number, because the mean of its divisors is an integer number (2257269840).

Almost surely, 2^25426527681 is an apocalyptic number.

It is an amenable number.

25426527681 is a deficient number, since it is larger than the sum of its proper divisors (10689789759).

25426527681 is a wasteful number, since it uses less digits than its factorization.

25426527681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5374556.

The product of its digits is 1612800, while the sum is 48.

The spelling of 25426527681 in words is "twenty-five billion, four hundred twenty-six million, five hundred twenty-seven thousand, six hundred eighty-one".