66665338 has 16 divisors (see below), whose sum is σ = 105618240. Its totient is φ = 31471200.

The previous prime is 66665329. The next prime is 66665341. The reversal of 66665338 is 83356666.

It is a junction number, because it is equal to n+sod(n) for n = 66665294 and 66665303.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8998 + ... + 14638.

It is an arithmetic number, because the mean of its divisors is an integer number (6601140).

Almost surely, 2^66665338 is an apocalyptic number.

66665338 is a deficient number, since it is larger than the sum of its proper divisors (38952902).

66665338 is a wasteful number, since it uses less digits than its factorization.

66665338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5973.

The product of its digits is 466560, while the sum is 43.

The square root of 66665338 is about 8164.8844449876. The cubic root of 66665338 is about 405.4774392806.

The spelling of 66665338 in words is "sixty-six million, six hundred sixty-five thousand, three hundred thirty-eight".