261224353251 has 24 divisors (see below), whose sum is σ = 392491859760. Its totient is φ = 167215406400.

The previous prime is 261224353219. The next prime is 261224353303. The reversal of 261224353251 is 152353422162.

261224353251 is a `hidden beast` number, since 2 + 61 + 22 + 43 + 532 + 5 + 1 = 666.

It is not a de Polignac number, because 261224353251 - 2⁵ = 261224353219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261224353651) 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, 2717565 + ... + 2812046.

It is an arithmetic number, because the mean of its divisors is an integer number (16353827490).

Almost surely, 2^261224353251 is an apocalyptic number.

261224353251 is a deficient number, since it is larger than the sum of its proper divisors (131267506509).

261224353251 is a wasteful number, since it uses less digits than its factorization.

261224353251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5529827 (or 5529824 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The spelling of 261224353251 in words is "two hundred sixty-one billion, two hundred twenty-four million, three hundred fifty-three thousand, two hundred fifty-one".