66631618306 has 32 divisors (see below), whose sum is σ = 110533248000. Its totient is φ = 29871750480.

The previous prime is 66631618279. The next prime is 66631618367. The reversal of 66631618306 is 60381613666.

66631618306 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063315 + ... + 1124233.

It is an arithmetic number, because the mean of its divisors is an integer number (3454164000).

Almost surely, 2^66631618306 is an apocalyptic number.

66631618306 is a deficient number, since it is larger than the sum of its proper divisors (43901629694).

66631618306 is a wasteful number, since it uses less digits than its factorization.

66631618306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61614.

The product of its (nonzero) digits is 559872, while the sum is 46.

The spelling of 66631618306 in words is "sixty-six billion, six hundred thirty-one million, six hundred eighteen thousand, three hundred six".