66378466 has 16 divisors (see below), whose sum is σ = 124136640. Its totient is φ = 25861680.

The previous prime is 66378463. The next prime is 66378491. The reversal of 66378466 is 66487366.

It is a super-2 number, since 2×66378466² = 8812201497026312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66378461) 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, 215361 + ... + 215668.

It is an arithmetic number, because the mean of its divisors is an integer number (7758540).

Almost surely, 2^66378466 is an apocalyptic number.

66378466 is a deficient number, since it is larger than the sum of its proper divisors (57758174).

66378466 is a wasteful number, since it uses less digits than its factorization.

66378466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431049.

The product of its digits is 870912, while the sum is 46.

The square root of 66378466 is about 8147.2980797317. The cubic root of 66378466 is about 404.8949908112.

Subtracting 66378466 from its reverse (66487366), we obtain a square (108900 = 330²).

The spelling of 66378466 in words is "sixty-six million, three hundred seventy-eight thousand, four hundred sixty-six".