66930173893 has 24 divisors (see below), whose sum is σ = 74980080000. Its totient is φ = 59682194880.

The previous prime is 66930173759. The next prime is 66930173897. The reversal of 66930173893 is 39837103966.

It is not a de Polignac number, because 66930173893 - 2²¹ = 66928076741 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 (66930173897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3295233 + ... + 3315481.

It is an arithmetic number, because the mean of its divisors is an integer number (3124170000).

Almost surely, 2^66930173893 is an apocalyptic number.

It is an amenable number.

66930173893 is a deficient number, since it is larger than the sum of its proper divisors (8049906107).

66930173893 is a wasteful number, since it uses less digits than its factorization.

66930173893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20793 (or 20782 counting only the distinct ones).

The product of its (nonzero) digits is 4408992, while the sum is 55.

The spelling of 66930173893 in words is "sixty-six billion, nine hundred thirty million, one hundred seventy-three thousand, eight hundred ninety-three".