66399146 has 16 divisors (see below), whose sum is σ = 108805248. Its totient is φ = 30139200.

The previous prime is 66399143. The next prime is 66399169. The reversal of 66399146 is 64199366.

It is a junction number, because it is equal to n+sod(n) for n = 66399097 and 66399106.

It is not an unprimeable number, because it can be changed into a prime (66399143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18386 + ... + 21698.

It is an arithmetic number, because the mean of its divisors is an integer number (6800328).

Almost surely, 2^66399146 is an apocalyptic number.

66399146 is a deficient number, since it is larger than the sum of its proper divisors (42406102).

66399146 is a wasteful number, since it uses less digits than its factorization.

66399146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4237.

The product of its digits is 209952, while the sum is 44.

The square root of 66399146 is about 8148.5671133028. The cubic root of 66399146 is about 404.9370343610.

The spelling of 66399146 in words is "sixty-six million, three hundred ninety-nine thousand, one hundred forty-six".