66933814693 has 4 divisors (see below), whose sum is σ = 66935399968. Its totient is φ = 66932229420.

The previous prime is 66933814681. The next prime is 66933814709. The reversal of 66933814693 is 39641833966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66933814693 - 2²⁵ = 66900260261 is a prime.

It is a super-4 number, since 4×66933814693⁴ (a number of 44 digits) contains 4444 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 (66933815693) 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, 727521 + ... + 814342.

It is an arithmetic number, because the mean of its divisors is an integer number (16733849992).

Almost surely, 2^66933814693 is an apocalyptic number.

It is an amenable number.

66933814693 is a deficient number, since it is larger than the sum of its proper divisors (1585275).

66933814693 is a wasteful number, since it uses less digits than its factorization.

66933814693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1585274.

The product of its digits is 15116544, while the sum is 58.

The spelling of 66933814693 in words is "sixty-six billion, nine hundred thirty-three million, eight hundred fourteen thousand, six hundred ninety-three".