66383749966 has 4 divisors (see below), whose sum is σ = 99575624952. Its totient is φ = 33191874982.

The previous prime is 66383749909. The next prime is 66383750051. The reversal of 66383749966 is 66994738366.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16595937490 + ... + 16595937493.

It is an arithmetic number, because the mean of its divisors is an integer number (24893906238).

Almost surely, 2^66383749966 is an apocalyptic number.

66383749966 is a deficient number, since it is larger than the sum of its proper divisors (33191874986).

66383749966 is a wasteful number, since it uses less digits than its factorization.

66383749966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33191874985.

The product of its digits is 211631616, while the sum is 67.

The spelling of 66383749966 in words is "sixty-six billion, three hundred eighty-three million, seven hundred forty-nine thousand, nine hundred sixty-six".