25656551 has 2 divisors, whose sum is σ = 25656552. Its totient is φ = 25656550.

The previous prime is 25656541. The next prime is 25656559. The reversal of 25656551 is 15565652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25656551 - 2⁶ = 25656487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25656559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12828275 + 12828276.

It is an arithmetic number, because the mean of its divisors is an integer number (12828276).

Almost surely, 2^25656551 is an apocalyptic number.

25656551 is a deficient number, since it is larger than the sum of its proper divisors (1).

25656551 is an equidigital number, since it uses as much as digits as its factorization.

25656551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45000, while the sum is 35.

The square root of 25656551 is about 5065.2296098005. The cubic root of 25656551 is about 294.9393766070.

The spelling of 25656551 in words is "twenty-five million, six hundred fifty-six thousand, five hundred fifty-one".