261215262568 has 32 divisors (see below), whose sum is σ = 538676328960. Its totient is φ = 117995762880.

The previous prime is 261215262533. The next prime is 261215262571. The reversal of 261215262568 is 865262512162.

261215262568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26715168 + ... + 26724943.

It is an arithmetic number, because the mean of its divisors is an integer number (16833635280).

Almost surely, 2^261215262568 is an apocalyptic number.

It is an amenable number.

261215262568 is an abundant number, since it is smaller than the sum of its proper divisors (277461066392).

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

261215262568 is a wasteful number, since it uses less digits than its factorization.

261215262568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53440177 (or 53440173 counting only the distinct ones).

The product of its digits is 691200, while the sum is 46.

The spelling of 261215262568 in words is "two hundred sixty-one billion, two hundred fifteen million, two hundred sixty-two thousand, five hundred sixty-eight".