25521323320 has 32 divisors (see below), whose sum is σ = 57646436400. Its totient is φ = 10168803328.

The previous prime is 25521323281. The next prime is 25521323353. The reversal of 25521323320 is 2332312552.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1231030 + ... + 1251589.

Almost surely, 2^25521323320 is an apocalyptic number.

25521323320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25521323320 is an abundant number, since it is smaller than the sum of its proper divisors (32125113080).

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

25521323320 is a wasteful number, since it uses less digits than its factorization.

25521323320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2482887 (or 2482883 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

Adding to 25521323320 its reverse (2332312552), we get a palindrome (27853635872).

The spelling of 25521323320 in words is "twenty-five billion, five hundred twenty-one million, three hundred twenty-three thousand, three hundred twenty".