25661417376 has 96 divisors (see below), whose sum is σ = 77009304960. Its totient is φ = 7329447936.

The previous prime is 25661417359. The next prime is 25661417387. The reversal of 25661417376 is 67371416652.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3738940 + ... + 3745796.

It is an arithmetic number, because the mean of its divisors is an integer number (802180260).

Almost surely, 2^25661417376 is an apocalyptic number.

It is an amenable number.

25661417376 is an abundant number, since it is smaller than the sum of its proper divisors (51347887584).

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

25661417376 is a wasteful number, since it uses less digits than its factorization.

25661417376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12446 (or 12438 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 48.

The spelling of 25661417376 in words is "twenty-five billion, six hundred sixty-one million, four hundred seventeen thousand, three hundred seventy-six".