25755538540 has 24 divisors (see below), whose sum is σ = 56933296560. Its totient is φ = 9759993408.

The previous prime is 25755538537. The next prime is 25755538561. The reversal of 25755538540 is 4583555752.

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, 33888487 + ... + 33889246.

It is an arithmetic number, because the mean of its divisors is an integer number (2372220690).

Almost surely, 2^25755538540 is an apocalyptic number.

25755538540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25755538540 is an abundant number, since it is smaller than the sum of its proper divisors (31177758020).

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

25755538540 is a wasteful number, since it uses less digits than its factorization.

25755538540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67777761 (or 67777759 counting only the distinct ones).

The product of its (nonzero) digits is 4200000, while the sum is 49.

The spelling of 25755538540 in words is "twenty-five billion, seven hundred fifty-five million, five hundred thirty-eight thousand, five hundred forty".