66366838 has 4 divisors (see below), whose sum is σ = 99550260. Its totient is φ = 33183418.

The previous prime is 66366767. The next prime is 66366847. The reversal of 66366838 is 83866366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83866366 = 2 ⋅41933183.

It is a super-2 number, since 2×66366838² = 8809114372236488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16591708 + ... + 16591711.

It is an arithmetic number, because the mean of its divisors is an integer number (24887565).

Almost surely, 2^66366838 is an apocalyptic number.

66366838 is a deficient number, since it is larger than the sum of its proper divisors (33183422).

66366838 is a wasteful number, since it uses less digits than its factorization.

66366838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33183421.

The product of its digits is 746496, while the sum is 46.

The square root of 66366838 is about 8146.5844376647. The cubic root of 66366838 is about 404.8713466277.

The spelling of 66366838 in words is "sixty-six million, three hundred sixty-six thousand, eight hundred thirty-eight".