25921872416 has 24 divisors (see below), whose sum is σ = 55673113104. Its totient is φ = 11782669120.

The previous prime is 25921872409. The next prime is 25921872419. The reversal of 25921872416 is 61427812952.

It is not an unprimeable number, because it can be changed into a prime (25921872419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36820490 + ... + 36821193.

It is an arithmetic number, because the mean of its divisors is an integer number (2319713046).

Almost surely, 2^25921872416 is an apocalyptic number.

It is an amenable number.

25921872416 is an abundant number, since it is smaller than the sum of its proper divisors (29751240688).

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

25921872416 is a wasteful number, since it uses less digits than its factorization.

25921872416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73641704 (or 73641696 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The spelling of 25921872416 in words is "twenty-five billion, nine hundred twenty-one million, eight hundred seventy-two thousand, four hundred sixteen".