66164642 has 8 divisors (see below), whose sum is σ = 99913500. Its totient is φ = 32860144.

The previous prime is 66164641. The next prime is 66164653. The reversal of 66164642 is 24646166.

It can be written as a sum of positive squares in 2 ways, for example, as 50395801 + 15768841 = 7099^2 + 3971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66164641) 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, 110717 + ... + 111312.

Almost surely, 2^66164642 is an apocalyptic number.

66164642 is a deficient number, since it is larger than the sum of its proper divisors (33748858).

66164642 is a wasteful number, since it uses less digits than its factorization.

66164642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222180.

The product of its digits is 41472, while the sum is 35.

The square root of 66164642 is about 8134.1651077415. The cubic root of 66164642 is about 404.4597623365.

The spelling of 66164642 in words is "sixty-six million, one hundred sixty-four thousand, six hundred forty-two".