25536661461 has 6 divisors (see below), whose sum is σ = 36886288790. Its totient is φ = 17024440968.

The previous prime is 25536661459. The next prime is 25536661487. The reversal of 25536661461 is 16416663552.

It can be written as a sum of positive squares in only one way, i.e., 22863254436 + 2673407025 = 151206^2 + 51705^2 .

It is not a de Polignac number, because 25536661461 - 2¹ = 25536661459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25536661411) 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 in 5 ways as a sum of consecutive naturals, for example, 1418703406 + ... + 1418703423.

Almost surely, 2^25536661461 is an apocalyptic number.

It is an amenable number.

25536661461 is a deficient number, since it is larger than the sum of its proper divisors (11349627329).

25536661461 is a wasteful number, since it uses less digits than its factorization.

25536661461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2837406835 (or 2837406832 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The spelling of 25536661461 in words is "twenty-five billion, five hundred thirty-six million, six hundred sixty-one thousand, four hundred sixty-one".