25520669 has 2 divisors, whose sum is σ = 25520670. Its totient is φ = 25520668.

The previous prime is 25520653. The next prime is 25520681. The reversal of 25520669 is 96602552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 68644 = 5045^2 + 262^2 .

It is a cyclic number.

It is not a de Polignac number, because 25520669 - 2⁴ = 25520653 is a prime.

It is a super-2 number, since 2×25520669² = 1302609092415122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25520699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760334 + 12760335.

It is an arithmetic number, because the mean of its divisors is an integer number (12760335).

Almost surely, 2^25520669 is an apocalyptic number.

It is an amenable number.

25520669 is a deficient number, since it is larger than the sum of its proper divisors (1).

25520669 is an equidigital number, since it uses as much as digits as its factorization.

25520669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 25520669 is about 5051.7985906012. The cubic root of 25520669 is about 294.4177695651.

The spelling of 25520669 in words is "twenty-five million, five hundred twenty thousand, six hundred sixty-nine".