66865714 has 4 divisors (see below), whose sum is σ = 100298574. Its totient is φ = 33432856.

The previous prime is 66865681. The next prime is 66865717. The reversal of 66865714 is 41756866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41756866 = 2 ⋅20878433.

It can be written as a sum of positive squares in only one way, i.e., 51912025 + 14953689 = 7205^2 + 3867^2 .

It is not an unprimeable number, because it can be changed into a prime (66865717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16716427 + ... + 16716430.

Almost surely, 2^66865714 is an apocalyptic number.

66865714 is a deficient number, since it is larger than the sum of its proper divisors (33432860).

66865714 is a wasteful number, since it uses less digits than its factorization.

66865714 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33432859.

The product of its digits is 241920, while the sum is 43.

The square root of 66865714 is about 8177.1458345807. The cubic root of 66865714 is about 405.8832807726.

The spelling of 66865714 in words is "sixty-six million, eight hundred sixty-five thousand, seven hundred fourteen".