2551661624 has 16 divisors (see below), whose sum is σ = 4895630520. Its totient is φ = 1246160160.

The previous prime is 2551661617. The next prime is 2551661633. The reversal of 2551661624 is 4261661552.

It is a congruent number.

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, 3708467 + ... + 3709154.

Almost surely, 2^2551661624 is an apocalyptic number.

It is an amenable number.

2551661624 is a deficient number, since it is larger than the sum of its proper divisors (2343968896).

2551661624 is a wasteful number, since it uses less digits than its factorization.

2551661624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7417670 (or 7417666 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The square root of 2551661624 is about 50513.9745417048. The cubic root of 2551661624 is about 1366.4938895071.

The spelling of 2551661624 in words is "two billion, five hundred fifty-one million, six hundred sixty-one thousand, six hundred twenty-four".