66018377 has 2 divisors, whose sum is σ = 66018378. Its totient is φ = 66018376.

The previous prime is 66018319. The next prime is 66018451. The reversal of 66018377 is 77381066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55591936 + 10426441 = 7456^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 66018377 - 2¹⁰ = 66017353 is a prime.

It is a super-2 number, since 2×66018377² = 8716852203428258, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66018377.

It is not a weakly prime, because it can be changed into another prime (66018307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33009188 + 33009189.

It is an arithmetic number, because the mean of its divisors is an integer number (33009189).

Almost surely, 2^66018377 is an apocalyptic number.

It is an amenable number.

66018377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66018377 is an equidigital number, since it uses as much as digits as its factorization.

66018377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66018377 is about 8125.1693520812. The cubic root of 66018377 is about 404.1615065956.

The spelling of 66018377 in words is "sixty-six million, eighteen thousand, three hundred seventy-seven".