261452436291 has 24 divisors (see below), whose sum is σ = 381232298304. Its totient is φ = 172650302640.

The previous prime is 261452436253. The next prime is 261452436367. The reversal of 261452436291 is 192634254162.

261452436291 is a `hidden beast` number, since 2 + 6 + 1 + 4 + 524 + 36 + 2 + 91 = 666.

It is not a de Polignac number, because 261452436291 - 2⁶ = 261452436227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261452436691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11054020 + ... + 11077646.

It is an arithmetic number, because the mean of its divisors is an integer number (15884679096).

Almost surely, 2^261452436291 is an apocalyptic number.

261452436291 is a deficient number, since it is larger than the sum of its proper divisors (119779862013).

261452436291 is a wasteful number, since it uses less digits than its factorization.

261452436291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35231 (or 35228 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 261452436291 in words is "two hundred sixty-one billion, four hundred fifty-two million, four hundred thirty-six thousand, two hundred ninety-one".