25781855464 has 16 divisors (see below), whose sum is σ = 48344500800. Its totient is φ = 12889988592.

The previous prime is 25781855447. The next prime is 25781855513. The reversal of 25781855464 is 46455818752.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7039 + ... + 227185.

It is an arithmetic number, because the mean of its divisors is an integer number (3021531300).

Almost surely, 2^25781855464 is an apocalyptic number.

It is an amenable number.

25781855464 is a deficient number, since it is larger than the sum of its proper divisors (22562645336).

25781855464 is a wasteful number, since it uses less digits than its factorization.

25781855464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234792 (or 234788 counting only the distinct ones).

The product of its digits is 10752000, while the sum is 55.

The spelling of 25781855464 in words is "twenty-five billion, seven hundred eighty-one million, eight hundred fifty-five thousand, four hundred sixty-four".