66348939 has 4 divisors (see below), whose sum is σ = 88465256. Its totient is φ = 44232624.

The previous prime is 66348937. The next prime is 66348941. The reversal of 66348939 is 93984366.

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

It is an interprime number because it is at equal distance from previous prime (66348937) and next prime (66348941).

It is not a de Polignac number, because 66348939 - 2¹ = 66348937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66348937) 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, 11058154 + ... + 11058159.

It is an arithmetic number, because the mean of its divisors is an integer number (22116314).

Almost surely, 2^66348939 is an apocalyptic number.

66348939 is a deficient number, since it is larger than the sum of its proper divisors (22116317).

66348939 is a wasteful number, since it uses less digits than its factorization.

66348939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22116316.

The product of its digits is 839808, while the sum is 48.

The square root of 66348939 is about 8145.4858050334. The cubic root of 66348939 is about 404.8349456980.

The spelling of 66348939 in words is "sixty-six million, three hundred forty-eight thousand, nine hundred thirty-nine".