66378159 has 12 divisors (see below), whose sum is σ = 96525000. Its totient is φ = 43954224.

The previous prime is 66378157. The next prime is 66378163. The reversal of 66378159 is 95187366.

It is a happy number.

66378159 is a `hidden beast` number, since 6 + 637 + 8 + 1 + 5 + 9 = 666.

It is not a de Polignac number, because 66378159 - 2¹ = 66378157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66378157) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23409 + ... + 26090.

It is an arithmetic number, because the mean of its divisors is an integer number (8043750).

Almost surely, 2^66378159 is an apocalyptic number.

66378159 is a deficient number, since it is larger than the sum of its proper divisors (30146841).

66378159 is a wasteful number, since it uses less digits than its factorization.

66378159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49654 (or 49651 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 66378159 is about 8147.2792391080. The cubic root of 66378159 is about 404.8943665980.

It can be divided in two parts, 66 and 378159, that added together give a square (378225 = 615²).

The spelling of 66378159 in words is "sixty-six million, three hundred seventy-eight thousand, one hundred fifty-nine".