261115052564 has 12 divisors (see below), whose sum is σ = 457037906388. Its totient is φ = 130532793600.

The previous prime is 261115052543. The next prime is 261115052573. The reversal of 261115052564 is 465250511162.

It can be written as a sum of positive squares in 2 ways, for example, as 119641275664 + 141473776900 = 345892^2 + 376130^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6159407 + ... + 6201654.

It is an arithmetic number, because the mean of its divisors is an integer number (38086492199).

Almost surely, 2^261115052564 is an apocalyptic number.

It is an amenable number.

261115052564 is a deficient number, since it is larger than the sum of its proper divisors (195922853824).

261115052564 is a wasteful number, since it uses less digits than its factorization.

261115052564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12366346 (or 12366344 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 38.

The spelling of 261115052564 in words is "two hundred sixty-one billion, one hundred fifteen million, fifty-two thousand, five hundred sixty-four".