66666785834 has 16 divisors (see below), whose sum is σ = 109126599840. Its totient is φ = 30293224560.

The previous prime is 66666785831. The next prime is 66666785879. The reversal of 66666785834 is 43858766666.

66666785834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66666785831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 423629 + ... + 559280.

It is an arithmetic number, because the mean of its divisors is an integer number (6820412490).

Almost surely, 2^66666785834 is an apocalyptic number.

66666785834 is a deficient number, since it is larger than the sum of its proper divisors (42459814006).

66666785834 is a wasteful number, since it uses less digits than its factorization.

66666785834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 986005.

The product of its digits is 209018880, while the sum is 65.

The spelling of 66666785834 in words is "sixty-six billion, six hundred sixty-six million, seven hundred eighty-five thousand, eight hundred thirty-four".