25313263521 has 32 divisors (see below), whose sum is σ = 42505774080. Its totient is φ = 13041532224.

The previous prime is 25313263487. The next prime is 25313263541. The reversal of 25313263521 is 12536231352.

It is not a de Polignac number, because 25313263521 - 2⁶ = 25313263457 is a prime.

It is a super-2 number, since 2×25313263521² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25313263541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1066431 + ... + 1089908.

It is an arithmetic number, because the mean of its divisors is an integer number (1328305440).

Almost surely, 2^25313263521 is an apocalyptic number.

25313263521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25313263521 is a deficient number, since it is larger than the sum of its proper divisors (17192510559).

25313263521 is a wasteful number, since it uses less digits than its factorization.

25313263521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156405.

The product of its digits is 32400, while the sum is 33.

Adding to 25313263521 its reverse (12536231352), we get a palindrome (37849494873).

The spelling of 25313263521 in words is "twenty-five billion, three hundred thirteen million, two hundred sixty-three thousand, five hundred twenty-one".