25977661 has 2 divisors, whose sum is σ = 25977662. Its totient is φ = 25977660.

The previous prime is 25977629. The next prime is 25977689. The reversal of 25977661 is 16677952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24552025 + 1425636 = 4955^2 + 1194^2 .

It is a cyclic number.

It is not a de Polignac number, because 25977661 - 2⁵ = 25977629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25977761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12988830 + 12988831.

It is an arithmetic number, because the mean of its divisors is an integer number (12988831).

Almost surely, 2^25977661 is an apocalyptic number.

It is an amenable number.

25977661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25977661 is an equidigital number, since it uses as much as digits as its factorization.

25977661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 43.

The square root of 25977661 is about 5096.8285236998. The cubic root of 25977661 is about 296.1647374019.

The spelling of 25977661 in words is "twenty-five million, nine hundred seventy-seven thousand, six hundred sixty-one".