25697279652 has 72 divisors (see below), whose sum is σ = 65958415488. Its totient is φ = 7780956480.

The previous prime is 25697279651. The next prime is 25697279677.

25697279652 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×25697279652² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25697279651) 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, 2059978 + ... + 2072414.

It is an arithmetic number, because the mean of its divisors is an integer number (916089104).

Almost surely, 2^25697279652 is an apocalyptic number.

25697279652 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25697279652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32979207744).

25697279652 is an abundant number, since it is smaller than the sum of its proper divisors (40261135836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25697279652 is a wasteful number, since it uses less digits than its factorization.

25697279652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13889 (or 13876 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 60.

The spelling of 25697279652 in words is "twenty-five billion, six hundred ninety-seven million, two hundred seventy-nine thousand, six hundred fifty-two".