66338237 has 4 divisors (see below), whose sum is σ = 75815136. Its totient is φ = 56861340.

The previous prime is 66338221. The next prime is 66338249. The reversal of 66338237 is 73283366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66338237 - 2⁴ = 66338221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66338237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66332237) 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, 4738439 + ... + 4738452.

It is an arithmetic number, because the mean of its divisors is an integer number (18953784).

Almost surely, 2^66338237 is an apocalyptic number.

It is an amenable number.

66338237 is a deficient number, since it is larger than the sum of its proper divisors (9476899).

66338237 is an equidigital number, since it uses as much as digits as its factorization.

66338237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9476898.

The product of its digits is 108864, while the sum is 38.

The square root of 66338237 is about 8144.8288502583. The cubic root of 66338237 is about 404.8131780726.

The spelling of 66338237 in words is "sixty-six million, three hundred thirty-eight thousand, two hundred thirty-seven".