261646204712025 has 48 divisors (see below), whose sum is σ = 497704765392000. Its totient is φ = 118806943925760.

The previous prime is 261646204712021. The next prime is 261646204712047. The reversal of 261646204712025 is 520217402646162.

It is not a de Polignac number, because 261646204712025 - 2² = 261646204712021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261646204712021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1672316820 + ... + 1672473269.

It is an arithmetic number, because the mean of its divisors is an integer number (10368849279000).

Almost surely, 2^{261646204712025} is an apocalyptic number.

261646204712025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261646204712025 is a deficient number, since it is larger than the sum of its proper divisors (236058560679975).

261646204712025 is a wasteful number, since it uses less digits than its factorization.

261646204712025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344790258 (or 3344790253 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 261646204712025 in words is "two hundred sixty-one trillion, six hundred forty-six billion, two hundred four million, seven hundred twelve thousand, twenty-five".