25400022520 has 16 divisors (see below), whose sum is σ = 57150050760. Its totient is φ = 10160008992.

The previous prime is 25400022509. The next prime is 25400022521. The reversal of 25400022520 is 2522000452.

It is a happy number.

It is a super-2 number, since 2×25400022520² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25400022491 and 25400022500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400022521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317500242 + ... + 317500321.

Almost surely, 2^25400022520 is an apocalyptic number.

25400022520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25400022520 is an abundant number, since it is smaller than the sum of its proper divisors (31750028240).

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

25400022520 is a wasteful number, since it uses less digits than its factorization.

25400022520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635000574 (or 635000570 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 22.

Adding to 25400022520 its reverse (2522000452), we get a palindrome (27922022972).

The spelling of 25400022520 in words is "twenty-five billion, four hundred million, twenty-two thousand, five hundred twenty".