261647374717025 has 24 divisors (see below), whose sum is σ = 353945978522400. Its totient is φ = 190284462748800.

The previous prime is 261647374716899. The next prime is 261647374717033. The reversal of 261647374717025 is 520717473746162.

It is not a de Polignac number, because 261647374717025 - 2¹⁸ = 261647374454881 is a prime.

It is a super-2 number, since 2×261647374717025² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 233621 + ... + 22876829.

It is an arithmetic number, because the mean of its divisors is an integer number (14747749105100).

Almost surely, 2^{261647374717025} is an apocalyptic number.

261647374717025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261647374717025 is a deficient number, since it is larger than the sum of its proper divisors (92298603805375).

261647374717025 is a wasteful number, since it uses less digits than its factorization.

261647374717025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22685249 (or 22685244 counting only the distinct ones).

The product of its (nonzero) digits is 82978560, while the sum is 62.

The spelling of 261647374717025 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, three hundred seventy-four million, seven hundred seventeen thousand, twenty-five".