261116326251 has 24 divisors (see below), whose sum is σ = 411480851184. Its totient is φ = 158242772160.

The previous prime is 261116326243. The next prime is 261116326277. The reversal of 261116326251 is 152623611162.

261116326251 is a `hidden beast` number, since 2 + 6 + 1 + 11 + 632 + 6 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 261116326251 - 2³ = 261116326243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261116396251) 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, 1790745 + ... + 1931061.

It is an arithmetic number, because the mean of its divisors is an integer number (17145035466).

Almost surely, 2^261116326251 is an apocalyptic number.

261116326251 is a deficient number, since it is larger than the sum of its proper divisors (150364524933).

261116326251 is a wasteful number, since it uses less digits than its factorization.

261116326251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159131 (or 159128 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 261116326251 in words is "two hundred sixty-one billion, one hundred sixteen million, three hundred twenty-six thousand, two hundred fifty-one".