668020411771 has 4 divisors (see below), whose sum is σ = 689569457344. Its totient is φ = 646471366200.

The previous prime is 668020411711. The next prime is 668020411781. The reversal of 668020411771 is 177114020866.

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 668020411771 - 2²³ = 668012023163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668020411711) 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, 10774522740 + ... + 10774522801.

It is an arithmetic number, because the mean of its divisors is an integer number (172392364336).

Almost surely, 2^668020411771 is an apocalyptic number.

668020411771 is a deficient number, since it is larger than the sum of its proper divisors (21549045573).

668020411771 is a wasteful number, since it uses less digits than its factorization.

668020411771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21549045572.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 668020411771 in words is "six hundred sixty-eight billion, twenty million, four hundred eleven thousand, seven hundred seventy-one".