666820802 has 8 divisors (see below), whose sum is σ = 1024627212. Its totient is φ = 325278400.

The previous prime is 666820799. The next prime is 666820879. The reversal of 666820802 is 208028666.

It can be written as a sum of positive squares in 2 ways, for example, as 455438281 + 211382521 = 21341^2 + 14539^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4065899 + ... + 4066062.

Almost surely, 2^666820802 is an apocalyptic number.

666820802 is a deficient number, since it is larger than the sum of its proper divisors (357806410).

666820802 is a wasteful number, since it uses less digits than its factorization.

666820802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8132004.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 666820802 is about 25822.8736201067. The cubic root of 666820802 is about 873.6477843565.

The spelling of 666820802 in words is "six hundred sixty-six million, eight hundred twenty thousand, eight hundred two".