66164641 has 2 divisors, whose sum is σ = 66164642. Its totient is φ = 66164640.

The previous prime is 66164591. The next prime is 66164653. The reversal of 66164641 is 14646166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 25715041 = 6360^2 + 5071^2 .

It is a cyclic number.

It is not a de Polignac number, because 66164641 - 2⁷ = 66164513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66164597 and 66164606.

It is not a weakly prime, because it can be changed into another prime (66164671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082320 + 33082321.

It is an arithmetic number, because the mean of its divisors is an integer number (33082321).

Almost surely, 2^66164641 is an apocalyptic number.

It is an amenable number.

66164641 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164641 is an equidigital number, since it uses as much as digits as its factorization.

66164641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 34.

The square root of 66164641 is about 8134.1650462724. The cubic root of 66164641 is about 404.4597602989.

The spelling of 66164641 in words is "sixty-six million, one hundred sixty-four thousand, six hundred forty-one".