66694383219 has 4 divisors (see below), whose sum is σ = 88925844296. Its totient is φ = 44462922144.

The previous prime is 66694383209. The next prime is 66694383229. The reversal of 66694383219 is 91238349666.

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

It is an interprime number because it is at equal distance from previous prime (66694383209) and next prime (66694383229).

It is not a de Polignac number, because 66694383219 - 2⁹ = 66694382707 is a prime.

It is a super-2 number, since 2×66694383219² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66694383209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11115730534 + ... + 11115730539.

It is an arithmetic number, because the mean of its divisors is an integer number (22231461074).

Almost surely, 2^66694383219 is an apocalyptic number.

66694383219 is a deficient number, since it is larger than the sum of its proper divisors (22231461077).

66694383219 is a wasteful number, since it uses less digits than its factorization.

66694383219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22231461076.

The product of its digits is 10077696, while the sum is 57.

The spelling of 66694383219 in words is "sixty-six billion, six hundred ninety-four million, three hundred eighty-three thousand, two hundred nineteen".