261560366 has 8 divisors (see below), whose sum is σ = 394395264. Its totient is φ = 130095280.

The previous prime is 261560359. The next prime is 261560371. The reversal of 261560366 is 663065162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341975 + ... + 342738.

It is an arithmetic number, because the mean of its divisors is an integer number (49299408).

Almost surely, 2^261560366 is an apocalyptic number.

261560366 is a deficient number, since it is larger than the sum of its proper divisors (132834898).

261560366 is a wasteful number, since it uses less digits than its factorization.

261560366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684906.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 261560366 is about 16172.8280149144. The cubic root of 261560366 is about 639.5246845148.

The spelling of 261560366 in words is "two hundred sixty-one million, five hundred sixty thousand, three hundred sixty-six".