66242793 has 4 divisors (see below), whose sum is σ = 88323728. Its totient is φ = 44161860.

The previous prime is 66242791. The next prime is 66242801. The reversal of 66242793 is 39724266.

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 66242793 - 2¹ = 66242791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66242791) 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, 11040463 + ... + 11040468.

It is an arithmetic number, because the mean of its divisors is an integer number (22080932).

Almost surely, 2^66242793 is an apocalyptic number.

It is an amenable number.

66242793 is a deficient number, since it is larger than the sum of its proper divisors (22080935).

66242793 is a wasteful number, since it uses less digits than its factorization.

66242793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22080934.

The product of its digits is 108864, while the sum is 39.

The square root of 66242793 is about 8138.9675635181. The cubic root of 66242793 is about 404.6189435196.

The spelling of 66242793 in words is "sixty-six million, two hundred forty-two thousand, seven hundred ninety-three".