261647574717025 has 12 divisors (see below), whose sum is σ = 370791991599232. Its totient is φ = 179415479805840.

The previous prime is 261647574716993. The next prime is 261647574717037. The reversal of 261647574717025 is 520717475746162.

It is not a de Polignac number, because 261647574717025 - 2⁵ = 261647574716993 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 747564499017 + ... + 747564499366.

Almost surely, 2^{261647574717025} is an apocalyptic number.

261647574717025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261647574717025 is a deficient number, since it is larger than the sum of its proper divisors (109144416882207).

261647574717025 is a wasteful number, since it uses less digits than its factorization.

261647574717025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495128998400 (or 1495128998395 counting only the distinct ones).

The product of its (nonzero) digits is 138297600, while the sum is 64.

The spelling of 261647574717025 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred seventy-four million, seven hundred seventeen thousand, twenty-five".