25685100131 has 8 divisors (see below), whose sum is σ = 27290097360. Its totient is φ = 24174207264.

The previous prime is 25685100121. The next prime is 25685100149. The reversal of 25685100131 is 13100158652.

It is a de Polignac number, because none of the positive numbers 2^k-25685100131 is a prime.

It is a super-2 number, since 2×25685100131² (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 (25685100121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2609081 + ... + 2618906.

It is an arithmetic number, because the mean of its divisors is an integer number (3411262170).

Almost surely, 2^25685100131 is an apocalyptic number.

25685100131 is a deficient number, since it is larger than the sum of its proper divisors (1604997229).

25685100131 is an frugal number, since it uses more digits than its factorization.

25685100131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5228038 (or 5228004 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 25685100131 its reverse (13100158652), we get a palindrome (38785258783).

The spelling of 25685100131 in words is "twenty-five billion, six hundred eighty-five million, one hundred thousand, one hundred thirty-one".