25423056520 has 16 divisors (see below), whose sum is σ = 57201877260. Its totient is φ = 10169222592.

The previous prime is 25423056481. The next prime is 25423056541. The reversal of 25423056520 is 2565032452.

It can be written as a sum of positive squares in 2 ways, for example, as 23270282116 + 2152774404 = 152546^2 + 46398^2 .

It is a super-2 number, since 2×25423056520² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317788167 + ... + 317788246.

Almost surely, 2^25423056520 is an apocalyptic number.

25423056520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25423056520 is an abundant number, since it is smaller than the sum of its proper divisors (31778820740).

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

25423056520 is a wasteful number, since it uses less digits than its factorization.

25423056520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635576424 (or 635576420 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 34.

Adding to 25423056520 its reverse (2565032452), we get a palindrome (27988088972).

The spelling of 25423056520 in words is "twenty-five billion, four hundred twenty-three million, fifty-six thousand, five hundred twenty".