2551611568 has 40 divisors (see below), whose sum is σ = 5396529600. Its totient is φ = 1159103040.

The previous prime is 2551611563. The next prime is 2551611607. The reversal of 2551611568 is 8651161552.

It is a self number, because there is not a number n which added to its sum of digits gives 2551611568.

It is not an unprimeable number, because it can be changed into a prime (2551611563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 365971 + ... + 372877.

It is an arithmetic number, because the mean of its divisors is an integer number (134913240).

Almost surely, 2^2551611568 is an apocalyptic number.

It is an amenable number.

2551611568 is an abundant number, since it is smaller than the sum of its proper divisors (2844918032).

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

2551611568 is a wasteful number, since it uses less digits than its factorization.

2551611568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9025 (or 9019 counting only the distinct ones).

The product of its digits is 72000, while the sum is 40.

The square root of 2551611568 is about 50513.4790724218. The cubic root of 2551611568 is about 1366.4849539355.

The spelling of 2551611568 in words is "two billion, five hundred fifty-one million, six hundred eleven thousand, five hundred sixty-eight".