668039916 has 24 divisors (see below), whose sum is σ = 1595011264. Its totient is φ = 217501200.

The previous prime is 668039903. The next prime is 668039917. The reversal of 668039916 is 619930866.

It is not an unprimeable number, because it can be changed into a prime (668039917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646810 + ... + 647841.

Almost surely, 2^668039916 is an apocalyptic number.

It is an amenable number.

668039916 is an abundant number, since it is smaller than the sum of its proper divisors (926971348).

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

668039916 is a wasteful number, since it uses less digits than its factorization.

668039916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294701 (or 1294699 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 668039916 is about 25846.4681533087. The cubic root of 668039916 is about 874.1798752499.

The spelling of 668039916 in words is "six hundred sixty-eight million, thirty-nine thousand, nine hundred sixteen".