665001256 has 16 divisors (see below), whose sum is σ = 1247178240. Its totient is φ = 332420400.

The previous prime is 665001221. The next prime is 665001287. The reversal of 665001256 is 652100566.

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, 39705 + ... + 53911.

It is an arithmetic number, because the mean of its divisors is an integer number (77948640).

Almost surely, 2^665001256 is an apocalyptic number.

It is an amenable number.

665001256 is a deficient number, since it is larger than the sum of its proper divisors (582176984).

665001256 is a wasteful number, since it uses less digits than its factorization.

665001256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20064 (or 20060 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 665001256 is about 25787.6182692392. The cubic root of 665001256 is about 872.8524230430.

The spelling of 665001256 in words is "six hundred sixty-five million, one thousand, two hundred fifty-six".