660068667 has 6 divisors (see below), whose sum is σ = 953432532. Its totient is φ = 440045772.

The previous prime is 660068653. The next prime is 660068677. The reversal of 660068667 is 766860066.

It is a happy number.

It is not a de Polignac number, because 660068667 - 2¹⁰ = 660067643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660068677) 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 5 ways as a sum of consecutive naturals, for example, 36670473 + ... + 36670490.

It is an arithmetic number, because the mean of its divisors is an integer number (158905422).

Almost surely, 2^660068667 is an apocalyptic number.

660068667 is a deficient number, since it is larger than the sum of its proper divisors (293363865).

660068667 is a wasteful number, since it uses less digits than its factorization.

660068667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73340969 (or 73340966 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 660068667 is about 25691.8015522462. The cubic root of 660068667 is about 870.6889627802.

The spelling of 660068667 in words is "six hundred sixty million, sixty-eight thousand, six hundred sixty-seven".