25578002550 has 48 divisors (see below), whose sum is σ = 64061538192. Its totient is φ = 6753264000.

The previous prime is 25578002533. The next prime is 25578002557. The reversal of 25578002550 is 5520087552.

It is a junction number, because it is equal to n+sod(n) for n = 25578002499 and 25578002508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25578002557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 829009 + ... + 859308.

It is an arithmetic number, because the mean of its divisors is an integer number (1334615379).

Almost surely, 2^25578002550 is an apocalyptic number.

25578002550 is an abundant number, since it is smaller than the sum of its proper divisors (38483535642).

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

25578002550 is a wasteful number, since it uses less digits than its factorization.

25578002550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688433 (or 1688428 counting only the distinct ones).

The product of its (nonzero) digits is 140000, while the sum is 39.

The spelling of 25578002550 in words is "twenty-five billion, five hundred seventy-eight million, two thousand, five hundred fifty".