668668716 has 48 divisors (see below), whose sum is σ = 1747271680. Its totient is φ = 221130000.

The previous prime is 668668711. The next prime is 668668717. The reversal of 668668716 is 617866866.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (668668711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10660 + ... + 38091.

Almost surely, 2^668668716 is an apocalyptic number.

It is an amenable number.

668668716 is an abundant number, since it is smaller than the sum of its proper divisors (1078602964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668668716 is a wasteful number, since it uses less digits than its factorization.

668668716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48891 (or 48883 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 54.

The square root of 668668716 is about 25858.6294300375. The cubic root of 668668716 is about 874.4540664157.

The spelling of 668668716 in words is "six hundred sixty-eight million, six hundred sixty-eight thousand, seven hundred sixteen".