261657032236525 has 12 divisors (see below), whose sum is σ = 326085145708000. Its totient is φ = 208273738218480.

The previous prime is 261657032236463. The next prime is 261657032236541. The reversal of 261657032236525 is 525632230756162.

It is not a de Polignac number, because 261657032236525 - 2¹⁵ = 261657032203757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26297184195 + ... + 26297194144.

Almost surely, 2^{261657032236525} is an apocalyptic number.

261657032236525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261657032236525 is a deficient number, since it is larger than the sum of its proper divisors (64428113471475).

261657032236525 is a wasteful number, since it uses less digits than its factorization.

261657032236525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52594378548 (or 52594378543 counting only the distinct ones).

The product of its (nonzero) digits is 27216000, while the sum is 55.

The spelling of 261657032236525 in words is "two hundred sixty-one trillion, six hundred fifty-seven billion, thirty-two million, two hundred thirty-six thousand, five hundred twenty-five".