261581567252570 has 48 divisors (see below), whose sum is σ = 496952120302560. Its totient is φ = 99121736272608.

The previous prime is 261581567252557. The next prime is 261581567252647. The reversal of 261581567252570 is 75252765185162.

261581567252570 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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 90923789 + ... + 93756591.

It is an arithmetic number, because the mean of its divisors is an integer number (10353169172970).

Almost surely, 2^{261581567252570} is an apocalyptic number.

261581567252570 is a deficient number, since it is larger than the sum of its proper divisors (235370553049990).

261581567252570 is a wasteful number, since it uses less digits than its factorization.

261581567252570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858427 (or 2858408 counting only the distinct ones).

The product of its (nonzero) digits is 70560000, while the sum is 62.

The spelling of 261581567252570 in words is "two hundred sixty-one trillion, five hundred eighty-one billion, five hundred sixty-seven million, two hundred fifty-two thousand, five hundred seventy".