666064358971 has 4 divisors (see below), whose sum is σ = 726615664344. Its totient is φ = 605513053600.

The previous prime is 666064358951. The next prime is 666064358977. The reversal of 666064358971 is 179853460666.

666064358971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666064358971 - 2³⁷ = 528625405499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666064358977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30275652670 + ... + 30275652691.

It is an arithmetic number, because the mean of its divisors is an integer number (181653916086).

Almost surely, 2^666064358971 is an apocalyptic number.

666064358971 is a deficient number, since it is larger than the sum of its proper divisors (60551305373).

666064358971 is a wasteful number, since it uses less digits than its factorization.

666064358971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60551305372.

The product of its (nonzero) digits is 39191040, while the sum is 61.

The spelling of 666064358971 in words is "six hundred sixty-six billion, sixty-four million, three hundred fifty-eight thousand, nine hundred seventy-one".