66164807 has 4 divisors (see below), whose sum is σ = 66181800. Its totient is φ = 66147816.

The previous prime is 66164803. The next prime is 66164873. The reversal of 66164807 is 70846166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70846166 = 2 ⋅35423083.

It is a cyclic number.

It is not a de Polignac number, because 66164807 - 2² = 66164803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66164801) 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, 569 + ... + 11517.

It is an arithmetic number, because the mean of its divisors is an integer number (16545450).

Almost surely, 2^66164807 is an apocalyptic number.

66164807 is a deficient number, since it is larger than the sum of its proper divisors (16993).

66164807 is a wasteful number, since it uses less digits than its factorization.

66164807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16992.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66164807 is about 8134.1752501406. The cubic root of 66164807 is about 404.4600985473.

The spelling of 66164807 in words is "sixty-six million, one hundred sixty-four thousand, eight hundred seven".