66418838 has 8 divisors (see below), whose sum is σ = 100067832. Its totient is φ = 33062896.

The previous prime is 66418819. The next prime is 66418861. The reversal of 66418838 is 83881466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×66418838² = 8822924082540488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72695 + ... + 73602.

It is an arithmetic number, because the mean of its divisors is an integer number (12508479).

Almost surely, 2^66418838 is an apocalyptic number.

66418838 is a deficient number, since it is larger than the sum of its proper divisors (33648994).

66418838 is a wasteful number, since it uses less digits than its factorization.

66418838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146526.

The product of its digits is 221184, while the sum is 44.

The square root of 66418838 is about 8149.7753343267. The cubic root of 66418838 is about 404.9770611405.

The spelling of 66418838 in words is "sixty-six million, four hundred eighteen thousand, eight hundred thirty-eight".