25130536516661 has 2 divisors, whose sum is σ = 25130536516662. Its totient is φ = 25130536516660.

The previous prime is 25130536516637. The next prime is 25130536516693. The reversal of 25130536516661 is 16661563503152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24257535937636 + 873000579025 = 4925194^2 + 934345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25130536516661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25130536516601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12565268258330 + 12565268258331.

It is an arithmetic number, because the mean of its divisors is an integer number (12565268258331).

Almost surely, 2^{25130536516661} is an apocalyptic number.

It is an amenable number.

25130536516661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25130536516661 is an equidigital number, since it uses as much as digits as its factorization.

25130536516661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916000, while the sum is 50.

The spelling of 25130536516661 in words is "twenty-five trillion, one hundred thirty billion, five hundred thirty-six million, five hundred sixteen thousand, six hundred sixty-one".