66094399 has 4 divisors (see below), whose sum is σ = 75536464. Its totient is φ = 56652336.

The previous prime is 66094373. The next prime is 66094403. The reversal of 66094399 is 99349066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66094399 - 2⁹ = 66093887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66094309) 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, 4721022 + ... + 4721035.

It is an arithmetic number, because the mean of its divisors is an integer number (18884116).

Almost surely, 2^66094399 is an apocalyptic number.

66094399 is a deficient number, since it is larger than the sum of its proper divisors (9442065).

66094399 is an equidigital number, since it uses as much as digits as its factorization.

66094399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9442064.

The product of its (nonzero) digits is 314928, while the sum is 46.

The square root of 66094399 is about 8129.8461855068. The cubic root of 66094399 is about 404.3165814973.

It can be divided in two parts, 660 and 94399, that added together give a palindrome (95059).

The spelling of 66094399 in words is "sixty-six million, ninety-four thousand, three hundred ninety-nine".