66844099 has 4 divisors (see below), whose sum is σ = 76393264. Its totient is φ = 57294936.

The previous prime is 66844093. The next prime is 66844103. The reversal of 66844099 is 99044866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99044866 = 2 ⋅49522433.

It is a cyclic number.

It is not a de Polignac number, because 66844099 - 2⁵ = 66844067 is a prime.

It is a super-2 number, since 2×66844099² = 8936267142243602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66844093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4774572 + ... + 4774585.

It is an arithmetic number, because the mean of its divisors is an integer number (19098316).

Almost surely, 2^66844099 is an apocalyptic number.

66844099 is a deficient number, since it is larger than the sum of its proper divisors (9549165).

66844099 is an equidigital number, since it uses as much as digits as its factorization.

66844099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549164.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 66844099 is about 8175.8240563261. The cubic root of 66844099 is about 405.8395408044.

The spelling of 66844099 in words is "sixty-six million, eight hundred forty-four thousand, ninety-nine".