66940115 has 8 divisors (see below), whose sum is σ = 87630768. Its totient is φ = 48683680.

The previous prime is 66940109. The next prime is 66940123. The reversal of 66940115 is 51104966.

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

It is not a de Polignac number, because 66940115 - 2¹⁰ = 66939091 is a prime.

It is a Duffinian number.

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, 608492 + ... + 608601.

It is an arithmetic number, because the mean of its divisors is an integer number (10953846).

Almost surely, 2^66940115 is an apocalyptic number.

66940115 is a deficient number, since it is larger than the sum of its proper divisors (20690653).

66940115 is a wasteful number, since it uses less digits than its factorization.

66940115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217109.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 66940115 is about 8181.6938955207. The cubic root of 66940115 is about 406.0337661095.

The spelling of 66940115 in words is "sixty-six million, nine hundred forty thousand, one hundred fifteen".