666735020 has 48 divisors (see below), whose sum is σ = 1601660928. Its totient is φ = 228381120.

The previous prime is 666734993. The next prime is 666735049. The reversal of 666735020 is 20537666.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248285 + ... + 250955.

It is an arithmetic number, because the mean of its divisors is an integer number (33367936).

Almost surely, 2^666735020 is an apocalyptic number.

It is an amenable number.

666735020 is an abundant number, since it is smaller than the sum of its proper divisors (934925908).

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

666735020 is a wasteful number, since it uses less digits than its factorization.

666735020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4470 (or 4468 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 666735020 is about 25821.2125973975. The cubic root of 666735020 is about 873.6103197843.

The spelling of 666735020 in words is "six hundred sixty-six million, seven hundred thirty-five thousand, twenty".