2551656740 has 12 divisors (see below), whose sum is σ = 5358479196. Its totient is φ = 1020662688.

The previous prime is 2551656733. The next prime is 2551656763. The reversal of 2551656740 is 476561552.

It can be written as a sum of positive squares in 2 ways, for example, as 822427684 + 1729229056 = 28678^2 + 41584^2 .

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, 63791399 + ... + 63791438.

It is an arithmetic number, because the mean of its divisors is an integer number (446539933).

Almost surely, 2^2551656740 is an apocalyptic number.

2551656740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2551656740 is an abundant number, since it is smaller than the sum of its proper divisors (2806822456).

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

2551656740 is a wasteful number, since it uses less digits than its factorization.

2551656740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127582846 (or 127582844 counting only the distinct ones).

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 2551656740 is about 50513.9261986237. The cubic root of 2551656740 is about 1366.4930176621.

The spelling of 2551656740 in words is "two billion, five hundred fifty-one million, six hundred fifty-six thousand, seven hundred forty".