66994307 has 4 divisors (see below), whose sum is σ = 67231320. Its totient is φ = 66757296.

The previous prime is 66994303. The next prime is 66994313. The reversal of 66994307 is 70349966.

66994307 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, and also an emirpimes, since its reverse is a distinct semiprime: 70349966 = 2 ⋅35174983.

It is a cyclic number.

It is not a de Polignac number, because 66994307 - 2² = 66994303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66994303) by changing a digit.

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, 118082 + ... + 118647.

It is an arithmetic number, because the mean of its divisors is an integer number (16807830).

Almost surely, 2^66994307 is an apocalyptic number.

66994307 is a deficient number, since it is larger than the sum of its proper divisors (237013).

66994307 is a wasteful number, since it uses less digits than its factorization.

66994307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237012.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 66994307 is about 8185.0050091616. The cubic root of 66994307 is about 406.1433060405.

The spelling of 66994307 in words is "sixty-six million, nine hundred ninety-four thousand, three hundred seven".