66706939 has 8 divisors (see below), whose sum is σ = 71907920. Its totient is φ = 61515936.

The previous prime is 66706879. The next prime is 66706943. The reversal of 66706939 is 93960766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66706939 - 2⁷ = 66706811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66706949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17209 + ... + 20725.

It is an arithmetic number, because the mean of its divisors is an integer number (8988490).

Almost surely, 2^66706939 is an apocalyptic number.

66706939 is a deficient number, since it is larger than the sum of its proper divisors (5200981).

66706939 is a wasteful number, since it uses less digits than its factorization.

66706939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4989.

The product of its (nonzero) digits is 367416, while the sum is 46.

The square root of 66706939 is about 8167.4316036316. The cubic root of 66706939 is about 405.5617647583.

The spelling of 66706939 in words is "sixty-six million, seven hundred six thousand, nine hundred thirty-nine".