66164081 has 2 divisors, whose sum is σ = 66164082. Its totient is φ = 66164080.

The previous prime is 66164069. The next prime is 66164083. The reversal of 66164081 is 18046166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51609856 + 14554225 = 7184^2 + 3815^2 .

It is a cyclic number.

It is not a de Polignac number, because 66164081 - 2¹⁰ = 66163057 is a prime.

It is a super-2 number, since 2×66164081² = 8755371229149122, which contains 22 as substring.

Together with 66164083, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66164083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082040 + 33082041.

It is an arithmetic number, because the mean of its divisors is an integer number (33082041).

Almost surely, 2^66164081 is an apocalyptic number.

It is an amenable number.

66164081 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164081 is an equidigital number, since it uses as much as digits as its factorization.

66164081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 66164081 is about 8134.1306234901. The cubic root of 66164081 is about 404.4586192156.

The spelling of 66164081 in words is "sixty-six million, one hundred sixty-four thousand, eighty-one".