66378337 has 4 divisors (see below), whose sum is σ = 67178160. Its totient is φ = 65578516.

The previous prime is 66378331. The next prime is 66378349. The reversal of 66378337 is 73387366.

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 66378337 - 2⁷ = 66378209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66378293 and 66378302.

It is not an unprimeable number, because it can be changed into a prime (66378331) 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, 399787 + ... + 399952.

It is an arithmetic number, because the mean of its divisors is an integer number (16794540).

Almost surely, 2^66378337 is an apocalyptic number.

It is an amenable number.

66378337 is a deficient number, since it is larger than the sum of its proper divisors (799823).

66378337 is an equidigital number, since it uses as much as digits as its factorization.

66378337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799822.

The product of its digits is 381024, while the sum is 43.

The square root of 66378337 is about 8147.2901629928. The cubic root of 66378337 is about 404.8947285199.

The spelling of 66378337 in words is "sixty-six million, three hundred seventy-eight thousand, three hundred thirty-seven".