25250277761 has 2 divisors, whose sum is σ = 25250277762. Its totient is φ = 25250277760.

The previous prime is 25250277709. The next prime is 25250277781. The reversal of 25250277761 is 16777205252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22456521025 + 2793756736 = 149855^2 + 52856^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25250277761 is a prime.

It is not a weakly prime, because it can be changed into another prime (25250277781) 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, 12625138880 + 12625138881.

It is an arithmetic number, because the mean of its divisors is an integer number (12625138881).

Almost surely, 2^25250277761 is an apocalyptic number.

It is an amenable number.

25250277761 is a deficient number, since it is larger than the sum of its proper divisors (1).

25250277761 is an equidigital number, since it uses as much as digits as its factorization.

25250277761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 411600, while the sum is 44.

The spelling of 25250277761 in words is "twenty-five billion, two hundred fifty million, two hundred seventy-seven thousand, seven hundred sixty-one".