66566612306 has 4 divisors (see below), whose sum is σ = 99849918462. Its totient is φ = 33283306152.

The previous prime is 66566612237. The next prime is 66566612317. The reversal of 66566612306 is 60321666566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 61238926225 + 5327686081 = 247465^2 + 72991^2 .

It is a super-2 number, since 2×66566612306² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16641653075 + ... + 16641653078.

Almost surely, 2^66566612306 is an apocalyptic number.

66566612306 is a deficient number, since it is larger than the sum of its proper divisors (33283306156).

66566612306 is a wasteful number, since it uses less digits than its factorization.

66566612306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33283306155.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The spelling of 66566612306 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred six".