660256347 has 16 divisors (see below), whose sum is σ = 886343168. Its totient is φ = 437179680.

The previous prime is 660256343. The next prime is 660256349. The reversal of 660256347 is 743652066.

It is not a de Polignac number, because 660256347 - 2² = 660256343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (660256343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463278 + ... + 464700.

It is an arithmetic number, because the mean of its divisors is an integer number (55396448).

Almost surely, 2^660256347 is an apocalyptic number.

660256347 is a deficient number, since it is larger than the sum of its proper divisors (226086821).

660256347 is a wasteful number, since it uses less digits than its factorization.

660256347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370.

The product of its (nonzero) digits is 181440, while the sum is 39.

The square root of 660256347 is about 25695.4538196935. The cubic root of 660256347 is about 870.7714771343.

The spelling of 660256347 in words is "six hundred sixty million, two hundred fifty-six thousand, three hundred forty-seven".