68166818 has 4 divisors (see below), whose sum is σ = 102250230. Its totient is φ = 34083408.

The previous prime is 68166817. The next prime is 68166823. The reversal of 68166818 is 81866186.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63952009 + 4214809 = 7997^2 + 2053^2 .

It is not an unprimeable number, because it can be changed into a prime (68166817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17041703 + ... + 17041706.

Almost surely, 2^68166818 is an apocalyptic number.

68166818 is a deficient number, since it is larger than the sum of its proper divisors (34083412).

68166818 is a wasteful number, since it uses less digits than its factorization.

68166818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34083411.

The product of its digits is 110592, while the sum is 44.

The square root of 68166818 is about 8256.3198823689. The cubic root of 68166818 is about 408.4990089700.

Multiplying 68166818 by its sum of digits (44), we get a palindrome (2999339992).

The spelling of 68166818 in words is "sixty-eight million, one hundred sixty-six thousand, eight hundred eighteen".