66566305802 has 16 divisors (see below), whose sum is σ = 104482968552. Its totient is φ = 31772594880.

The previous prime is 66566305759. The next prime is 66566305823. The reversal of 66566305802 is 20850366566.

It can be written as a sum of positive squares in 4 ways, for example, as 64643571001 + 1922734801 = 254251^2 + 43849^2 .

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, 8482349 + ... + 8490192.

Almost surely, 2^66566305802 is an apocalyptic number.

66566305802 is a deficient number, since it is larger than the sum of its proper divisors (37916662750).

66566305802 is a wasteful number, since it uses less digits than its factorization.

66566305802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16972633.

The product of its (nonzero) digits is 1555200, while the sum is 47.

The spelling of 66566305802 in words is "sixty-six billion, five hundred sixty-six million, three hundred five thousand, eight hundred two".