66893775993 has 32 divisors (see below), whose sum is σ = 108888998400. Its totient is φ = 40249990800.

The previous prime is 66893775979. The next prime is 66893776009. The reversal of 66893775993 is 39957739866.

66893775993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66893775993 - 2³⁰ = 65820034169 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66893775973) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768903 + ... + 851468.

It is an arithmetic number, because the mean of its divisors is an integer number (3402781200).

Almost surely, 2^66893775993 is an apocalyptic number.

It is an amenable number.

66893775993 is a deficient number, since it is larger than the sum of its proper divisors (41995222407).

66893775993 is a wasteful number, since it uses less digits than its factorization.

66893775993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620530 (or 1620524 counting only the distinct ones).

The product of its digits is 462944160, while the sum is 72.

The spelling of 66893775993 in words is "sixty-six billion, eight hundred ninety-three million, seven hundred seventy-five thousand, nine hundred ninety-three".