66939293 has 8 divisors (see below), whose sum is σ = 67596000. Its totient is φ = 66285648.

The previous prime is 66939283. The next prime is 66939311. The reversal of 66939293 is 39293966.

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 66939293 - 2⁴ = 66939277 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 (66939283) 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, 77498 + ... + 78356.

It is an arithmetic number, because the mean of its divisors is an integer number (8449500).

Almost surely, 2^66939293 is an apocalyptic number.

It is an amenable number.

66939293 is a deficient number, since it is larger than the sum of its proper divisors (656707).

66939293 is a wasteful number, since it uses less digits than its factorization.

66939293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531.

The product of its digits is 472392, while the sum is 47.

The square root of 66939293 is about 8181.6436612700. The cubic root of 66939293 is about 406.0321041209.

The spelling of 66939293 in words is "sixty-six million, nine hundred thirty-nine thousand, two hundred ninety-three".