66164971 has 4 divisors (see below), whose sum is σ = 67096944. Its totient is φ = 65233000.

The previous prime is 66164963. The next prime is 66164993. The reversal of 66164971 is 17946166.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66164971 - 2³ = 66164963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66164671) 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, 465880 + ... + 466021.

It is an arithmetic number, because the mean of its divisors is an integer number (16774236).

Almost surely, 2^66164971 is an apocalyptic number.

66164971 is a deficient number, since it is larger than the sum of its proper divisors (931973).

66164971 is an equidigital number, since it uses as much as digits as its factorization.

66164971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931972.

The product of its digits is 54432, while the sum is 40.

The square root of 66164971 is about 8134.1853310581. The cubic root of 66164971 is about 404.4604327200.

The spelling of 66164971 in words is "sixty-six million, one hundred sixty-four thousand, nine hundred seventy-one".