261432072057225 has 24 divisors (see below), whose sum is σ = 451027157360832. Its totient is φ = 133368245454400.

The previous prime is 261432072057223. The next prime is 261432072057241. The reversal of 261432072057225 is 522750270234162.

It is a happy number.

It is not a de Polignac number, because 261432072057225 - 2¹ = 261432072057223 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261432072057223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75777410466 + ... + 75777413915.

It is an arithmetic number, because the mean of its divisors is an integer number (18792798223368).

Almost surely, 2^{261432072057225} is an apocalyptic number.

261432072057225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261432072057225 is a deficient number, since it is larger than the sum of its proper divisors (189595085303607).

261432072057225 is a wasteful number, since it uses less digits than its factorization.

261432072057225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151554824417 (or 151554824412 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 48.

The spelling of 261432072057225 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, seventy-two million, fifty-seven thousand, two hundred twenty-five".