25555220520 has 32 divisors (see below), whose sum is σ = 76665661920. Its totient is φ = 6814725440.

The previous prime is 25555220519. The next prime is 25555220527. The reversal of 25555220520 is 2502255552.

It is not an unprimeable number, because it can be changed into a prime (25555220527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106479966 + ... + 106480205.

It is an arithmetic number, because the mean of its divisors is an integer number (2395801935).

Almost surely, 2^25555220520 is an apocalyptic number.

25555220520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25555220520 is an abundant number, since it is smaller than the sum of its proper divisors (51110441400).

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

25555220520 is a wasteful number, since it uses less digits than its factorization.

25555220520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212960185 (or 212960181 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 33.

The spelling of 25555220520 in words is "twenty-five billion, five hundred fifty-five million, two hundred twenty thousand, five hundred twenty".