668242818071 has 32 divisors (see below), whose sum is σ = 724943831040. Its totient is φ = 613699946496.

The previous prime is 668242818029. The next prime is 668242818083. The reversal of 668242818071 is 170818242866.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668242818071 is a prime.

It is a super-2 number, since 2×668242818071² (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 (668242818091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44850095 + ... + 44864991.

It is an arithmetic number, because the mean of its divisors is an integer number (22654494720).

Almost surely, 2^668242818071 is an apocalyptic number.

668242818071 is a deficient number, since it is larger than the sum of its proper divisors (56701012969).

668242818071 is a wasteful number, since it uses less digits than its factorization.

668242818071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15383.

The product of its (nonzero) digits is 2064384, while the sum is 53.

The spelling of 668242818071 in words is "six hundred sixty-eight billion, two hundred forty-two million, eight hundred eighteen thousand, seventy-one".