2551945539 has 24 divisors (see below), whose sum is σ = 4027744336. Its totient is φ = 1427659200.

The previous prime is 2551945523. The next prime is 2551945573. The reversal of 2551945539 is 9355491552.

It is not a de Polignac number, because 2551945539 - 2⁴ = 2551945523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2551945339) 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, 265672 + ... + 275109.

Almost surely, 2^2551945539 is an apocalyptic number.

2551945539 is a deficient number, since it is larger than the sum of its proper divisors (1475798797).

2551945539 is a wasteful number, since it uses less digits than its factorization.

2551945539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540819 (or 540808 counting only the distinct ones).

The product of its digits is 1215000, while the sum is 48.

The square root of 2551945539 is about 50516.7847254752. The cubic root of 2551945539 is about 1366.5445693883.

The spelling of 2551945539 in words is "two billion, five hundred fifty-one million, nine hundred forty-five thousand, five hundred thirty-nine".