666778596119 has 4 divisors (see below), whose sum is σ = 666843906360. Its totient is φ = 666713285880.

The previous prime is 666778596053. The next prime is 666778596131. The reversal of 666778596119 is 911695877666.

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 666778596119 - 2⁸ = 666778595863 is a prime.

It is a super-2 number, since 2×666778596119² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666778596019) 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, 32639804 + ... + 32660225.

It is an arithmetic number, because the mean of its divisors is an integer number (166710976590).

Almost surely, 2^666778596119 is an apocalyptic number.

666778596119 is a deficient number, since it is larger than the sum of its proper divisors (65310241).

666778596119 is a wasteful number, since it uses less digits than its factorization.

666778596119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65310240.

The product of its digits is 205752960, while the sum is 71.

The spelling of 666778596119 in words is "six hundred sixty-six billion, seven hundred seventy-eight million, five hundred ninety-six thousand, one hundred nineteen".