261235330266 has 32 divisors (see below), whose sum is σ = 529281739008. Its totient is φ = 85949660160.

The previous prime is 261235330253. The next prime is 261235330283. The reversal of 261235330266 is 662033532162.

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, 635986 + ... + 962781.

It is an arithmetic number, because the mean of its divisors is an integer number (16540054344).

Almost surely, 2^261235330266 is an apocalyptic number.

261235330266 is an abundant number, since it is smaller than the sum of its proper divisors (268046408742).

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

261235330266 is a wasteful number, since it uses less digits than its factorization.

261235330266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599126.

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 261235330266 in words is "two hundred sixty-one billion, two hundred thirty-five million, three hundred thirty thousand, two hundred sixty-six".