660686066 has 8 divisors (see below), whose sum is σ = 991589040. Its totient is φ = 330156388.

The previous prime is 660686057. The next prime is 660686077.

It is a happy number.

660686066 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 88856 + ... + 96003.

It is an arithmetic number, because the mean of its divisors is an integer number (123948630).

Almost surely, 2^660686066 is an apocalyptic number.

660686066 is a deficient number, since it is larger than the sum of its proper divisors (330902974).

660686066 is a wasteful number, since it uses less digits than its factorization.

660686066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186648.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 660686066 is about 25703.8142305768. The cubic root of 660686066 is about 870.9603461502.

The spelling of 660686066 in words is "six hundred sixty million, six hundred eighty-six thousand, sixty-six".