25656157 has 2 divisors, whose sum is σ = 25656158. Its totient is φ = 25656156.

The previous prime is 25656131. The next prime is 25656181. The reversal of 25656157 is 75165652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25613721 + 42436 = 5061^2 + 206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25656157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25656107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828078 + 12828079.

It is an arithmetic number, because the mean of its divisors is an integer number (12828079).

Almost surely, 2^25656157 is an apocalyptic number.

It is an amenable number.

25656157 is a deficient number, since it is larger than the sum of its proper divisors (1).

25656157 is an equidigital number, since it uses as much as digits as its factorization.

25656157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 37.

The square root of 25656157 is about 5065.1907170412. The cubic root of 25656157 is about 294.9378668339.

The spelling of 25656157 in words is "twenty-five million, six hundred fifty-six thousand, one hundred fifty-seven".