668223710518 has 48 divisors (see below), whose sum is σ = 1276955865360. Its totient is φ = 259871661504.

The previous prime is 668223710509. The next prime is 668223710519. The reversal of 668223710518 is 815017322866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668223710519) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4369821 + ... + 4520152.

It is an arithmetic number, because the mean of its divisors is an integer number (26603247195).

Almost surely, 2^668223710518 is an apocalyptic number.

668223710518 is a deficient number, since it is larger than the sum of its proper divisors (608732154842).

668223710518 is a wasteful number, since it uses less digits than its factorization.

668223710518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8890061 (or 8890054 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 49.

The spelling of 668223710518 in words is "six hundred sixty-eight billion, two hundred twenty-three million, seven hundred ten thousand, five hundred eighteen".