66164543 has 2 divisors, whose sum is σ = 66164544. Its totient is φ = 66164542.

The previous prime is 66164531. The next prime is 66164569. The reversal of 66164543 is 34546166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66164543 - 2²² = 61970239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66164503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082271 + 33082272.

It is an arithmetic number, because the mean of its divisors is an integer number (33082272).

Almost surely, 2^66164543 is an apocalyptic number.

66164543 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164543 is an equidigital number, since it uses as much as digits as its factorization.

66164543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 66164543 is about 8134.1590222960. The cubic root of 66164543 is about 404.4595606098.

The spelling of 66164543 in words is "sixty-six million, one hundred sixty-four thousand, five hundred forty-three".