66371331899 has 4 divisors (see below), whose sum is σ = 66428402136. Its totient is φ = 66314261664.

The previous prime is 66371331877. The next prime is 66371331941. The reversal of 66371331899 is 99813317366.

It is a happy number.

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 66371331899 - 2²⁸ = 66102896443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66371321899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28533374 + ... + 28535699.

It is an arithmetic number, because the mean of its divisors is an integer number (16607100534).

Almost surely, 2^66371331899 is an apocalyptic number.

66371331899 is a deficient number, since it is larger than the sum of its proper divisors (57070237).

66371331899 is a wasteful number, since it uses less digits than its factorization.

66371331899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57070236.

The product of its digits is 4408992, while the sum is 56.

The spelling of 66371331899 in words is "sixty-six billion, three hundred seventy-one million, three hundred thirty-one thousand, eight hundred ninety-nine".