66078946 has 4 divisors (see below), whose sum is σ = 99118422. Its totient is φ = 33039472.

The previous prime is 66078911. The next prime is 66078953. The reversal of 66078946 is 64987066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64987066 = 2 ⋅32493533.

It can be written as a sum of positive squares in only one way, i.e., 57168721 + 8910225 = 7561^2 + 2985^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66078896 and 66078905.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16519735 + ... + 16519738.

Almost surely, 2^66078946 is an apocalyptic number.

66078946 is a deficient number, since it is larger than the sum of its proper divisors (33039476).

66078946 is a wasteful number, since it uses less digits than its factorization.

66078946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33039475.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 66078946 is about 8128.8957429653. The cubic root of 66078946 is about 404.2850690382.

The spelling of 66078946 in words is "sixty-six million, seventy-eight thousand, nine hundred forty-six".