261960256 has 14 divisors (see below), whose sum is σ = 519827510. Its totient is φ = 130980096.

The previous prime is 261960247. The next prime is 261960263. The reversal of 261960256 is 652069162.

It can be written as a sum of positive squares in only one way, i.e., 215502400 + 46457856 = 14680^2 + 6816^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2046501 + ... + 2046628.

Almost surely, 2^261960256 is an apocalyptic number.

It is an amenable number.

261960256 is a deficient number, since it is larger than the sum of its proper divisors (257867254).

261960256 is an equidigital number, since it uses as much as digits as its factorization.

261960256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093141 (or 4093131 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 261960256 is about 16185.1863134164. The cubic root of 261960256 is about 639.8504337995.

The spelling of 261960256 in words is "two hundred sixty-one million, nine hundred sixty thousand, two hundred fifty-six".