66715066 has 16 divisors (see below), whose sum is σ = 109631808. Its totient is φ = 30196800.

The previous prime is 66715063. The next prime is 66715093. The reversal of 66715066 is 66051766.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66715063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 990 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (6851988).

Almost surely, 2^66715066 is an apocalyptic number.

66715066 is a deficient number, since it is larger than the sum of its proper divisors (42916742).

66715066 is a wasteful number, since it uses less digits than its factorization.

66715066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12837.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 66715066 is about 8167.9291133065. The cubic root of 66715066 is about 405.5782341425.

The spelling of 66715066 in words is "sixty-six million, seven hundred fifteen thousand, sixty-six".