66695371199 has 4 divisors (see below), whose sum is σ = 67182198864. Its totient is φ = 66208543536.

The previous prime is 66695371157. The next prime is 66695371207. The reversal of 66695371199 is 99117359666.

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

It is a cyclic number.

It is not a de Polignac number, because 66695371199 - 2²⁰ = 66694322623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66695371139) by changing a digit.

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, 243413627 + ... + 243413900.

It is an arithmetic number, because the mean of its divisors is an integer number (16795549716).

Almost surely, 2^66695371199 is an apocalyptic number.

66695371199 is a deficient number, since it is larger than the sum of its proper divisors (486827665).

66695371199 is a wasteful number, since it uses less digits than its factorization.

66695371199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486827664.

The product of its digits is 16533720, while the sum is 62.

The spelling of 66695371199 in words is "sixty-six billion, six hundred ninety-five million, three hundred seventy-one thousand, one hundred ninety-nine".