666779011789 has 4 divisors (see below), whose sum is σ = 727395285600. Its totient is φ = 606162737980.

The previous prime is 666779011741. The next prime is 666779011823. The reversal of 666779011789 is 987110977666.

666779011789 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666779011789 - 2²⁹ = 666242140877 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 (666779011739) 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, 30308136889 + ... + 30308136910.

It is an arithmetic number, because the mean of its divisors is an integer number (181848821400).

Almost surely, 2^666779011789 is an apocalyptic number.

It is an amenable number.

666779011789 is a deficient number, since it is larger than the sum of its proper divisors (60616273811).

666779011789 is a wasteful number, since it uses less digits than its factorization.

666779011789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60616273810.

The product of its (nonzero) digits is 48009024, while the sum is 67.

The spelling of 666779011789 in words is "six hundred sixty-six billion, seven hundred seventy-nine million, eleven thousand, seven hundred eighty-nine".