2561175157 has 2 divisors, whose sum is σ = 2561175158. Its totient is φ = 2561175156.

The previous prime is 2561175151. The next prime is 2561175247. The reversal of 2561175157 is 7515711652.

2561175157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2291919876 + 269255281 = 47874^2 + 16409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2561175157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2561175151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1280587578 + 1280587579.

It is an arithmetic number, because the mean of its divisors is an integer number (1280587579).

Almost surely, 2^2561175157 is an apocalyptic number.

It is an amenable number.

2561175157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2561175157 is an equidigital number, since it uses as much as digits as its factorization.

2561175157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73500, while the sum is 40.

The square root of 2561175157 is about 50608.0542700468. The cubic root of 2561175157 is about 1368.1900472163.

The spelling of 2561175157 in words is "two billion, five hundred sixty-one million, one hundred seventy-five thousand, one hundred fifty-seven".