66036389 has 2 divisors, whose sum is σ = 66036390. Its totient is φ = 66036388.

The previous prime is 66036307. The next prime is 66036401. The reversal of 66036389 is 98363066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65448100 + 588289 = 8090^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 66036389 - 2¹² = 66032293 is a prime.

It is a Chen prime.

It is equal to p_3898157 and since 66036389 and 3898157 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66036589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33018194 + 33018195.

It is an arithmetic number, because the mean of its divisors is an integer number (33018195).

Almost surely, 2^66036389 is an apocalyptic number.

It is an amenable number.

66036389 is a deficient number, since it is larger than the sum of its proper divisors (1).

66036389 is an equidigital number, since it uses as much as digits as its factorization.

66036389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 66036389 is about 8126.2776841553. The cubic root of 66036389 is about 404.1982594687.

The spelling of 66036389 in words is "sixty-six million, thirty-six thousand, three hundred eighty-nine".