668950065 has 48 divisors (see below), whose sum is σ = 1326993408. Its totient is φ = 305382528.

The previous prime is 668950049. The next prime is 668950067. The reversal of 668950065 is 560059866.

668950065 is a `hidden beast` number, since 6 + 6 + 89 + 500 + 65 = 666.

It is not a de Polignac number, because 668950065 - 2⁴ = 668950049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 668950065.

It is not an unprimeable number, because it can be changed into a prime (668950067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 401424 + ... + 403086.

It is an arithmetic number, because the mean of its divisors is an integer number (27645696).

Almost surely, 2^668950065 is an apocalyptic number.

It is an amenable number.

668950065 is a deficient number, since it is larger than the sum of its proper divisors (658043343).

668950065 is a wasteful number, since it uses less digits than its factorization.

668950065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958 (or 2955 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 668950065 is about 25864.0689954230. The cubic root of 668950065 is about 874.5766942947.

The spelling of 668950065 in words is "six hundred sixty-eight million, nine hundred fifty thousand, sixty-five".