25509166680 has 64 divisors (see below), whose sum is σ = 80555270400. Its totient is φ = 6444420480.

The previous prime is 25509166679. The next prime is 25509166681. The reversal of 25509166680 is 8666190552.

It is an interprime number because it is at equal distance from previous prime (25509166679) and next prime (25509166681).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25509166681) 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, 5591836 + ... + 5596395.

It is an arithmetic number, because the mean of its divisors is an integer number (1258676100).

Almost surely, 2^25509166680 is an apocalyptic number.

25509166680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25509166680 is an abundant number, since it is smaller than the sum of its proper divisors (55046103720).

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

25509166680 is a wasteful number, since it uses less digits than its factorization.

25509166680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11188264 (or 11188260 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 48.

The spelling of 25509166680 in words is "twenty-five billion, five hundred nine million, one hundred sixty-six thousand, six hundred eighty".