2551945538 has 12 divisors (see below), whose sum is σ = 3964469730. Its totient is φ = 1231972896.

The previous prime is 2551945523. The next prime is 2551945573. The reversal of 2551945538 is 8355491552.

It can be written as a sum of positive squares in 3 ways, for example, as 2283215089 + 268730449 = 47783^2 + 16393^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2551945492 and 2551945501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 756923 + ... + 760286.

Almost surely, 2^2551945538 is an apocalyptic number.

2551945538 is a deficient number, since it is larger than the sum of its proper divisors (1412524192).

2551945538 is a wasteful number, since it uses less digits than its factorization.

2551945538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1517269 (or 1517240 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 47.

The square root of 2551945538 is about 50516.7847155775. The cubic root of 2551945538 is about 1366.5445692098.

The spelling of 2551945538 in words is "two billion, five hundred fifty-one million, nine hundred forty-five thousand, five hundred thirty-eight".