660645268 has 6 divisors (see below), whose sum is σ = 1156129226. Its totient is φ = 330322632.

The previous prime is 660645253. The next prime is 660645281. The reversal of 660645268 is 862546066.

It can be written as a sum of positive squares in only one way, i.e., 660387204 + 258064 = 25698^2 + 508^2 .

It is a congruent number.

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, 82580655 + ... + 82580662.

Almost surely, 2^660645268 is an apocalyptic number.

It is an amenable number.

660645268 is a deficient number, since it is larger than the sum of its proper divisors (495483958).

660645268 is a wasteful number, since it uses less digits than its factorization.

660645268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165161321 (or 165161319 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 43.

The square root of 660645268 is about 25703.0206006998. The cubic root of 660645268 is about 870.9424182349.

The spelling of 660645268 in words is "six hundred sixty million, six hundred forty-five thousand, two hundred sixty-eight".