261326031759264 has 24 divisors (see below), whose sum is σ = 685980833368320. Its totient is φ = 87108677253056.

The previous prime is 261326031759263. The next prime is 261326031759313. The reversal of 261326031759264 is 462957130623162.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (261326031759263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361073081984 + ... + 1361073082175.

It is an arithmetic number, because the mean of its divisors is an integer number (28582534723680).

Almost surely, 2^{261326031759264} is an apocalyptic number.

261326031759264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

261326031759264 is an abundant number, since it is smaller than the sum of its proper divisors (424654801609056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261326031759264 is a wasteful number, since it uses less digits than its factorization.

261326031759264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2722146164172 (or 2722146164164 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 57.

The spelling of 261326031759264 in words is "two hundred sixty-one trillion, three hundred twenty-six billion, thirty-one million, seven hundred fifty-nine thousand, two hundred sixty-four".