261246532765 has 16 divisors (see below), whose sum is σ = 318926626560. Its totient is φ = 205379308480.

The previous prime is 261246532699. The next prime is 261246532777. The reversal of 261246532765 is 567235642162.

It is not a de Polignac number, because 261246532765 - 2²³ = 261238144157 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 647052 + ... + 970138.

It is an arithmetic number, because the mean of its divisors is an integer number (19932914160).

Almost surely, 2^261246532765 is an apocalyptic number.

It is an amenable number.

261246532765 is a deficient number, since it is larger than the sum of its proper divisors (57680093795).

261246532765 is a wasteful number, since it uses less digits than its factorization.

261246532765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325892.

The product of its digits is 3628800, while the sum is 49.

The spelling of 261246532765 in words is "two hundred sixty-one billion, two hundred forty-six million, five hundred thirty-two thousand, seven hundred sixty-five".