261334641567 has 16 divisors (see below), whose sum is σ = 349539730272. Its totient is φ = 173677048320.

The previous prime is 261334641517. The next prime is 261334641587. The reversal of 261334641567 is 765146433162.

It is not a de Polignac number, because 261334641567 - 2⁸ = 261334641311 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261334641517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1364803 + ... + 1544459.

It is an arithmetic number, because the mean of its divisors is an integer number (21846233142).

Almost surely, 2^261334641567 is an apocalyptic number.

261334641567 is a deficient number, since it is larger than the sum of its proper divisors (88205088705).

261334641567 is a wasteful number, since it uses less digits than its factorization.

261334641567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181178.

The product of its digits is 2177280, while the sum is 48.

The spelling of 261334641567 in words is "two hundred sixty-one billion, three hundred thirty-four million, six hundred forty-one thousand, five hundred sixty-seven".