25557052780 has 48 divisors (see below), whose sum is σ = 61351799040. Its totient is φ = 8760293568.

The previous prime is 25557052777. The next prime is 25557052789. The reversal of 25557052780 is 8725075552.

It is a self number, because there is not a number n which added to its sum of digits gives 25557052780.

It is not an unprimeable number, because it can be changed into a prime (25557052789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624591 + ... + 664249.

It is an arithmetic number, because the mean of its divisors is an integer number (1278162480).

Almost surely, 2^25557052780 is an apocalyptic number.

25557052780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25557052780 is an abundant number, since it is smaller than the sum of its proper divisors (35794746260).

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

25557052780 is a wasteful number, since it uses less digits than its factorization.

25557052780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44278 (or 44276 counting only the distinct ones).

The product of its (nonzero) digits is 980000, while the sum is 46.

The spelling of 25557052780 in words is "twenty-five billion, five hundred fifty-seven million, fifty-two thousand, seven hundred eighty".