668333794280 has 32 divisors (see below), whose sum is σ = 1518639670440. Its totient is φ = 264686649600.

The previous prime is 668333794241. The next prime is 668333794333. The reversal of 668333794280 is 82497333866.

It can be written as a sum of positive squares in 4 ways, for example, as 668152568836 + 181225444 = 817406^2 + 13462^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82710539 + ... + 82718618.

Almost surely, 2^668333794280 is an apocalyptic number.

It is an amenable number.

668333794280 is an abundant number, since it is smaller than the sum of its proper divisors (850305876160).

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

668333794280 is a wasteful number, since it uses less digits than its factorization.

668333794280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165429269 (or 165429265 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 59.

The spelling of 668333794280 in words is "six hundred sixty-eight billion, three hundred thirty-three million, seven hundred ninety-four thousand, two hundred eighty".