666065963898 has 32 divisors (see below), whose sum is σ = 1482345993600. Its totient is φ = 221692076928.

The previous prime is 666065963867. The next prime is 666065963963. The reversal of 666065963898 is 898369560666.

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, 9127518 + ... + 9200201.

It is an arithmetic number, because the mean of its divisors is an integer number (46323312300).

Almost surely, 2^666065963898 is an apocalyptic number.

666065963898 is an abundant number, since it is smaller than the sum of its proper divisors (816280029702).

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

666065963898 is a wasteful number, since it uses less digits than its factorization.

666065963898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18328403 (or 18328397 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 72.

The spelling of 666065963898 in words is "six hundred sixty-six billion, sixty-five million, nine hundred sixty-three thousand, eight hundred ninety-eight".