66738115 has 4 divisors (see below), whose sum is σ = 80085744. Its totient is φ = 53390488.

The previous prime is 66738109. The next prime is 66738131. The reversal of 66738115 is 51183766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51183766 = 2 ⋅25591883.

It is a cyclic number.

It is not a de Polignac number, because 66738115 - 2¹⁵ = 66705347 is a prime.

It is a Duffinian 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 in 3 ways as a sum of consecutive naturals, for example, 6673807 + ... + 6673816.

It is an arithmetic number, because the mean of its divisors is an integer number (20021436).

Almost surely, 2^66738115 is an apocalyptic number.

66738115 is a deficient number, since it is larger than the sum of its proper divisors (13347629).

66738115 is a wasteful number, since it uses less digits than its factorization.

66738115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347628.

The product of its digits is 30240, while the sum is 37.

The square root of 66738115 is about 8169.3399366167. The cubic root of 66738115 is about 405.6249357195.

The spelling of 66738115 in words is "sixty-six million, seven hundred thirty-eight thousand, one hundred fifteen".