66067715 has 16 divisors (see below), whose sum is σ = 91116480. Its totient is φ = 45048960.

The previous prime is 66067711. The next prime is 66067717. The reversal of 66067715 is 51776066.

It is not a de Polignac number, because 66067715 - 2² = 66067711 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66067711) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1121 + ... + 11549.

It is an arithmetic number, because the mean of its divisors is an integer number (5694780).

Almost surely, 2^66067715 is an apocalyptic number.

66067715 is a deficient number, since it is larger than the sum of its proper divisors (25048765).

66067715 is a wasteful number, since it uses less digits than its factorization.

66067715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10622.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 66067715 is about 8128.2049063739. The cubic root of 66067715 is about 404.2621631903.

The spelling of 66067715 in words is "sixty-six million, sixty-seven thousand, seven hundred fifteen".