66317793 has 4 divisors (see below), whose sum is σ = 88423728. Its totient is φ = 44211860.

The previous prime is 66317789. The next prime is 66317813. The reversal of 66317793 is 39771366.

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 66317793 - 2² = 66317789 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66317723) 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, 11052963 + ... + 11052968.

It is an arithmetic number, because the mean of its divisors is an integer number (22105932).

Almost surely, 2^66317793 is an apocalyptic number.

It is an amenable number.

66317793 is a deficient number, since it is larger than the sum of its proper divisors (22105935).

66317793 is a wasteful number, since it uses less digits than its factorization.

66317793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22105934.

The product of its digits is 142884, while the sum is 42.

The square root of 66317793 is about 8143.5737241091. The cubic root of 66317793 is about 404.7715889314.

The spelling of 66317793 in words is "sixty-six million, three hundred seventeen thousand, seven hundred ninety-three".