66381277694 has 8 divisors (see below), whose sum is σ = 99849276720. Its totient is φ = 33098185456.

The previous prime is 66381277679. The next prime is 66381277747. The reversal of 66381277694 is 49677218366.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46225799 + ... + 46227234.

It is an arithmetic number, because the mean of its divisors is an integer number (12481159590).

Almost surely, 2^66381277694 is an apocalyptic number.

66381277694 is a deficient number, since it is larger than the sum of its proper divisors (33467999026).

66381277694 is a wasteful number, since it uses less digits than its factorization.

66381277694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92453394.

The product of its digits is 18289152, while the sum is 59.

The spelling of 66381277694 in words is "sixty-six billion, three hundred eighty-one million, two hundred seventy-seven thousand, six hundred ninety-four".