261159522870 has 32 divisors (see below), whose sum is σ = 626815133280. Its totient is φ = 69638952960.

The previous prime is 261159522863. The next prime is 261159522887. The reversal of 261159522870 is 78225951162.

It is a Curzon number.

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, 396246 + ... + 824214.

It is an arithmetic number, because the mean of its divisors is an integer number (19587972915).

Almost surely, 2^261159522870 is an apocalyptic number.

261159522870 is an abundant number, since it is smaller than the sum of its proper divisors (365655610410).

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

261159522870 is a wasteful number, since it uses less digits than its factorization.

261159522870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448320.

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 261159522870 in words is "two hundred sixty-one billion, one hundred fifty-nine million, five hundred twenty-two thousand, eight hundred seventy".