66918346 has 16 divisors (see below), whose sum is σ = 110180448. Its totient is φ = 30229200.

The previous prime is 66918343. The next prime is 66918347. The reversal of 66918346 is 64381966.

It is not an unprimeable number, because it can be changed into a prime (66918343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5745 + ... + 12916.

It is an arithmetic number, because the mean of its divisors is an integer number (6886278).

Almost surely, 2^66918346 is an apocalyptic number.

66918346 is a deficient number, since it is larger than the sum of its proper divisors (43262102).

66918346 is a wasteful number, since it uses less digits than its factorization.

66918346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18837.

The product of its digits is 186624, while the sum is 43.

The square root of 66918346 is about 8180.3634393589. The cubic root of 66918346 is about 405.9897471264.

The spelling of 66918346 in words is "sixty-six million, nine hundred eighteen thousand, three hundred forty-six".