66567666 has 24 divisors (see below), whose sum is σ = 146340432. Its totient is φ = 20171800.

The previous prime is 66567647. The next prime is 66567701. The reversal of 66567666 is 66676566.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45120 + ... + 46571.

It is an arithmetic number, because the mean of its divisors is an integer number (6097518).

Almost surely, 2^66567666 is an apocalyptic number.

66567666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66567666 is an abundant number, since it is smaller than the sum of its proper divisors (79772766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66567666 is a wasteful number, since it uses less digits than its factorization.

66567666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91718 (or 91707 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The square root of 66567666 is about 8158.9010289377. The cubic root of 66567666 is about 405.2793195846.

Subtracting 66567666 from its reverse (66676566), we obtain a square (108900 = 330²).

The spelling of 66567666 in words is "sixty-six million, five hundred sixty-seven thousand, six hundred sixty-six".