66164437 has 2 divisors, whose sum is σ = 66164438. Its totient is φ = 66164436.

The previous prime is 66164431. The next prime is 66164489. The reversal of 66164437 is 73446166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 7043716 = 7689^2 + 2654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66164437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66164396 and 66164405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66164431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082218 + 33082219.

It is an arithmetic number, because the mean of its divisors is an integer number (33082219).

Almost surely, 2^66164437 is an apocalyptic number.

It is an amenable number.

66164437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164437 is an equidigital number, since it uses as much as digits as its factorization.

66164437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 37.

The square root of 66164437 is about 8134.1525065615. The cubic root of 66164437 is about 404.4593446193.

The spelling of 66164437 in words is "sixty-six million, one hundred sixty-four thousand, four hundred thirty-seven".