666666700039 has 4 divisors (see below), whose sum is σ = 667476745456. Its totient is φ = 665856654624.

The previous prime is 666666700033. The next prime is 666666700067. The reversal of 666666700039 is 930007666666.

666666700039 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 666666700039 - 2²¹ = 666664602887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666700033) 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, 405021474 + ... + 405023119.

It is an arithmetic number, because the mean of its divisors is an integer number (166869186364).

Almost surely, 2^666666700039 is an apocalyptic number.

666666700039 is a deficient number, since it is larger than the sum of its proper divisors (810045417).

666666700039 is an equidigital number, since it uses as much as digits as its factorization.

666666700039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810045416.

The product of its (nonzero) digits is 8817984, while the sum is 55.

The spelling of 666666700039 in words is "six hundred sixty-six billion, six hundred sixty-six million, seven hundred thousand, thirty-nine".