25277512661 has 2 divisors, whose sum is σ = 25277512662. Its totient is φ = 25277512660.

The previous prime is 25277512639. The next prime is 25277512669. The reversal of 25277512661 is 16621577252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18822193636 + 6455319025 = 137194^2 + 80345^2 .

It is a cyclic number.

It is not a de Polignac number, because 25277512661 - 2⁶ = 25277512597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25277512669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12638756330 + 12638756331.

It is an arithmetic number, because the mean of its divisors is an integer number (12638756331).

Almost surely, 2^25277512661 is an apocalyptic number.

It is an amenable number.

25277512661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25277512661 is an equidigital number, since it uses as much as digits as its factorization.

25277512661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 352800, while the sum is 44.

The spelling of 25277512661 in words is "twenty-five billion, two hundred seventy-seven million, five hundred twelve thousand, six hundred sixty-one".