668740716 has 36 divisors (see below), whose sum is σ = 1931918352. Its totient is φ = 191068704.

The previous prime is 668740673. The next prime is 668740753. The reversal of 668740716 is 617047866.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1326615 + ... + 1327118.

Almost surely, 2^668740716 is an apocalyptic number.

It is an amenable number.

668740716 is an abundant number, since it is smaller than the sum of its proper divisors (1263177636).

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

668740716 is a wasteful number, since it uses less digits than its factorization.

668740716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2653750 (or 2653745 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 668740716 is about 25860.0215777172. The cubic root of 668740716 is about 874.4854513809.

The spelling of 668740716 in words is "six hundred sixty-eight million, seven hundred forty thousand, seven hundred sixteen".