261647577354025 has 12 divisors (see below), whose sum is σ = 334908899014144. Its totient is φ = 202565866338000.

The previous prime is 261647577354019. The next prime is 261647577354049. The reversal of 261647577354025 is 520453775746162.

It is not a de Polignac number, because 261647577354025 - 2³⁹ = 261097821540137 is a prime.

It is a hoax number, since the sum of its digits (64) coincides with the sum of the digits of its distinct prime factors.

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, 168804887841 + ... + 168804889390.

Almost surely, 2^{261647577354025} is an apocalyptic number.

261647577354025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261647577354025 is a deficient number, since it is larger than the sum of its proper divisors (73261321660119).

261647577354025 is a wasteful number, since it uses less digits than its factorization.

261647577354025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337609777272 (or 337609777267 counting only the distinct ones).

The product of its (nonzero) digits is 296352000, while the sum is 64.

The spelling of 261647577354025 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred seventy-seven million, three hundred fifty-four thousand, twenty-five".