660573375066 has 64 divisors (see below), whose sum is σ = 1613999554560. Its totient is φ = 198597556080.

The previous prime is 660573375043. The next prime is 660573375073.

It is a happy number.

660573375066 is a `hidden beast` number, since 6 + 6 + 0 + 573 + 3 + 7 + 5 + 0 + 66 = 666.

660573375066 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4302816 + ... + 4453691.

It is an arithmetic number, because the mean of its divisors is an integer number (25218743040).

Almost surely, 2^660573375066 is an apocalyptic number.

660573375066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

660573375066 is an abundant number, since it is smaller than the sum of its proper divisors (953426179494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660573375066 is a wasteful number, since it uses less digits than its factorization.

660573375066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8756656 (or 8756650 counting only the distinct ones).

The product of its (nonzero) digits is 14288400, while the sum is 54.

The spelling of 660573375066 in words is "six hundred sixty billion, five hundred seventy-three million, three hundred seventy-five thousand, sixty-six".