66863138 has 4 divisors (see below), whose sum is σ = 100294710. Its totient is φ = 33431568.

The previous prime is 66863129. The next prime is 66863149. The reversal of 66863138 is 83136866.

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., 41692849 + 25170289 = 6457^2 + 5017^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66863095 and 66863104.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16715783 + ... + 16715786.

Almost surely, 2^66863138 is an apocalyptic number.

66863138 is a deficient number, since it is larger than the sum of its proper divisors (33431572).

66863138 is a wasteful number, since it uses less digits than its factorization.

66863138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33431571.

The product of its digits is 124416, while the sum is 41.

The square root of 66863138 is about 8176.9883208917. The cubic root of 66863138 is about 405.8780684912.

The spelling of 66863138 in words is "sixty-six million, eight hundred sixty-three thousand, one hundred thirty-eight".