66899793 has 4 divisors (see below), whose sum is σ = 89199728. Its totient is φ = 44599860.

The previous prime is 66899719. The next prime is 66899797. The reversal of 66899793 is 39799866.

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 not a de Polignac number, because 66899793 - 2¹⁷ = 66768721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66899797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11149963 + ... + 11149968.

It is an arithmetic number, because the mean of its divisors is an integer number (22299932).

Almost surely, 2^66899793 is an apocalyptic number.

It is an amenable number.

66899793 is a deficient number, since it is larger than the sum of its proper divisors (22299935).

66899793 is a wasteful number, since it uses less digits than its factorization.

66899793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22299934.

The product of its digits is 4408992, while the sum is 57.

The square root of 66899793 is about 8179.2293646773. The cubic root of 66899793 is about 405.9522236646.

The spelling of 66899793 in words is "sixty-six million, eight hundred ninety-nine thousand, seven hundred ninety-three".