25690686831 has 24 divisors (see below), whose sum is σ = 37383121776. Its totient is φ = 17000893440.

The previous prime is 25690686821. The next prime is 25690686851. The reversal of 25690686831 is 13868609652.

It is a happy number.

It is not a de Polignac number, because 25690686831 - 2⁵ = 25690686799 is a prime.

It is a super-2 number, since 2×25690686831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25690686811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784716 + ... + 816798.

It is an arithmetic number, because the mean of its divisors is an integer number (1557630074).

Almost surely, 2^25690686831 is an apocalyptic number.

25690686831 is a deficient number, since it is larger than the sum of its proper divisors (11692434945).

25690686831 is a wasteful number, since it uses less digits than its factorization.

25690686831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32743 (or 32740 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 54.

The spelling of 25690686831 in words is "twenty-five billion, six hundred ninety million, six hundred eighty-six thousand, eight hundred thirty-one".