261309542312 has 64 divisors (see below), whose sum is σ = 615852357120. Its totient is φ = 101175717888.

The previous prime is 261309542309. The next prime is 261309542339. The reversal of 261309542312 is 213245903162.

It is a happy 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, 3784313 + ... + 3852744.

It is an arithmetic number, because the mean of its divisors is an integer number (9622693080).

Almost surely, 2^261309542312 is an apocalyptic number.

It is an amenable number.

261309542312 is an abundant number, since it is smaller than the sum of its proper divisors (354542814808).

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

261309542312 is a wasteful number, since it uses less digits than its factorization.

261309542312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7637130 (or 7637126 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 261309542312 in words is "two hundred sixty-one billion, three hundred nine million, five hundred forty-two thousand, three hundred twelve".