668820802 has 16 divisors (see below), whose sum is σ = 1081011960. Its totient is φ = 308512512.

The previous prime is 668820799. The next prime is 668820811. The reversal of 668820802 is 208028866.

It can be written as a sum of positive squares in 4 ways, for example, as 204461401 + 464359401 = 14299^2 + 21549^2 .

It is a super-3 number, since 3×668820802³ (a number of 27 digits) contains 333 as substring.

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, 47578 + ... + 60010.

Almost surely, 2^668820802 is an apocalyptic number.

668820802 is a deficient number, since it is larger than the sum of its proper divisors (412191158).

668820802 is a wasteful number, since it uses less digits than its factorization.

668820802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14517.

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 668820802 is about 25861.5699832783. The cubic root of 668820802 is about 874.5203584057.

The spelling of 668820802 in words is "six hundred sixty-eight million, eight hundred twenty thousand, eight hundred two".