66016667 has 4 divisors (see below), whose sum is σ = 66362496. Its totient is φ = 65670840.

The previous prime is 66016651. The next prime is 66016669. The reversal of 66016667 is 76661066.

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: 76661066 = 2 ⋅38330533.

It is a cyclic number.

It is not a de Polignac number, because 66016667 - 2⁴ = 66016651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66016667.

It is not an unprimeable number, because it can be changed into a prime (66016669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172628 + ... + 173009.

It is an arithmetic number, because the mean of its divisors is an integer number (16590624).

Almost surely, 2^66016667 is an apocalyptic number.

66016667 is a deficient number, since it is larger than the sum of its proper divisors (345829).

66016667 is a wasteful number, since it uses less digits than its factorization.

66016667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345828.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66016667 is about 8125.0641228239. The cubic root of 66016667 is about 404.1580170513.

The spelling of 66016667 in words is "sixty-six million, sixteen thousand, six hundred sixty-seven".