261943531260 has 24 divisors (see below), whose sum is σ = 733441887696. Its totient is φ = 69851608320.

The previous prime is 261943531249. The next prime is 261943531373. The reversal of 261943531260 is 62135349162.

It is a super-2 number, since 2×261943531260² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2182862701 + ... + 2182862820.

It is an arithmetic number, because the mean of its divisors is an integer number (30560078654).

Almost surely, 2^261943531260 is an apocalyptic number.

261943531260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261943531260 is an abundant number, since it is smaller than the sum of its proper divisors (471498356436).

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

261943531260 is a wasteful number, since it uses less digits than its factorization.

261943531260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365725533 (or 4365725531 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The spelling of 261943531260 in words is "two hundred sixty-one billion, nine hundred forty-three million, five hundred thirty-one thousand, two hundred sixty".