261731502276 has 24 divisors (see below), whose sum is σ = 611237458944. Its totient is φ = 87168031200.

The previous prime is 261731502233. The next prime is 261731502283. The reversal of 261731502276 is 672205137162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9460975 + ... + 9488598.

It is an arithmetic number, because the mean of its divisors is an integer number (25468227456).

Almost surely, 2^261731502276 is an apocalyptic number.

It is an amenable number.

261731502276 is an abundant number, since it is smaller than the sum of its proper divisors (349505956668).

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

261731502276 is a wasteful number, since it uses less digits than its factorization.

261731502276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18950731 (or 18950729 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 261731502276 in words is "two hundred sixty-one billion, seven hundred thirty-one million, five hundred two thousand, two hundred seventy-six".