66858118 has 4 divisors (see below), whose sum is σ = 100287180. Its totient is φ = 33429058.

The previous prime is 66858107. The next prime is 66858133. The reversal of 66858118 is 81185866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81185866 = 2 ⋅40592933.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16714528 + ... + 16714531.

It is an arithmetic number, because the mean of its divisors is an integer number (25071795).

Almost surely, 2^66858118 is an apocalyptic number.

66858118 is a deficient number, since it is larger than the sum of its proper divisors (33429062).

66858118 is a wasteful number, since it uses less digits than its factorization.

66858118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33429061.

The product of its digits is 92160, while the sum is 43.

The square root of 66858118 is about 8176.6813561493. The cubic root of 66858118 is about 405.8679106326.

The spelling of 66858118 in words is "sixty-six million, eight hundred fifty-eight thousand, one hundred eighteen".