25666776408 has 64 divisors (see below), whose sum is σ = 78974703360. Its totient is φ = 6769259136.

The previous prime is 25666776407. The next prime is 25666776413. The reversal of 25666776408 is 80467766652.

It is a super-2 number, since 2×25666776408² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666776407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5873910 + ... + 5878277.

It is an arithmetic number, because the mean of its divisors is an integer number (1233979740).

Almost surely, 2^25666776408 is an apocalyptic number.

25666776408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

25666776408 is an abundant number, since it is smaller than the sum of its proper divisors (53307926952).

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

25666776408 is a wasteful number, since it uses less digits than its factorization.

25666776408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11752216 (or 11752212 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 57.

The spelling of 25666776408 in words is "twenty-five billion, six hundred sixty-six million, seven hundred seventy-six thousand, four hundred eight".