66994465 has 4 divisors (see below), whose sum is σ = 80393364. Its totient is φ = 53595568.

The previous prime is 66994453. The next prime is 66994481. The reversal of 66994465 is 56449966.

66994465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 59243809 = 2784^2 + 7697^2 .

It is a cyclic number.

It is not a de Polignac number, because 66994465 - 2⁷ = 66994337 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6699442 + ... + 6699451.

It is an arithmetic number, because the mean of its divisors is an integer number (20098341).

Almost surely, 2^66994465 is an apocalyptic number.

It is an amenable number.

66994465 is a deficient number, since it is larger than the sum of its proper divisors (13398899).

66994465 is a wasteful number, since it uses less digits than its factorization.

66994465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13398898.

The product of its digits is 1399680, while the sum is 49.

The square root of 66994465 is about 8185.0146609520. The cubic root of 66994465 is about 406.1436253243.

The spelling of 66994465 in words is "sixty-six million, nine hundred ninety-four thousand, four hundred sixty-five".