25161232157 has 2 divisors, whose sum is σ = 25161232158. Its totient is φ = 25161232156.

The previous prime is 25161232153. The next prime is 25161232183. The reversal of 25161232157 is 75123216152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15279679321 + 9881552836 = 123611^2 + 99406^2 .

It is a cyclic number.

It is not a de Polignac number, because 25161232157 - 2² = 25161232153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25161232153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12580616078 + 12580616079.

It is an arithmetic number, because the mean of its divisors is an integer number (12580616079).

Almost surely, 2^25161232157 is an apocalyptic number.

It is an amenable number.

25161232157 is a deficient number, since it is larger than the sum of its proper divisors (1).

25161232157 is an equidigital number, since it uses as much as digits as its factorization.

25161232157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 35.

The spelling of 25161232157 in words is "twenty-five billion, one hundred sixty-one million, two hundred thirty-two thousand, one hundred fifty-seven".