66829673831 has 4 divisors (see below), whose sum is σ = 67168910952. Its totient is φ = 66490436712.

The previous prime is 66829673809. The next prime is 66829673843. The reversal of 66829673831 is 13837692866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13837692866 = 2 ⋅6918846433.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66829673831 is a prime.

It is a super-2 number, since 2×66829673831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66829676831) 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, 169618265 + ... + 169618658.

It is an arithmetic number, because the mean of its divisors is an integer number (16792227738).

Almost surely, 2^66829673831 is an apocalyptic number.

66829673831 is a deficient number, since it is larger than the sum of its proper divisors (339237121).

66829673831 is a wasteful number, since it uses less digits than its factorization.

66829673831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339237120.

The product of its digits is 15676416, while the sum is 59.

The spelling of 66829673831 in words is "sixty-six billion, eight hundred twenty-nine million, six hundred seventy-three thousand, eight hundred thirty-one".