668508335077 has 4 divisors (see below), whose sum is σ = 729281820096. Its totient is φ = 607734850060.

The previous prime is 668508335051. The next prime is 668508335119. The reversal of 668508335077 is 770533805866.

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 a de Polignac number, because none of the positive numbers 2^k-668508335077 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 (668508335477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30386742493 + ... + 30386742514.

It is an arithmetic number, because the mean of its divisors is an integer number (182320455024).

Almost surely, 2^668508335077 is an apocalyptic number.

It is an amenable number.

668508335077 is a deficient number, since it is larger than the sum of its proper divisors (60773485019).

668508335077 is a wasteful number, since it uses less digits than its factorization.

668508335077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60773485018.

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 668508335077 in words is "six hundred sixty-eight billion, five hundred eight million, three hundred thirty-five thousand, seventy-seven".