66312377 has 2 divisors, whose sum is σ = 66312378. Its totient is φ = 66312376.

The previous prime is 66312373. The next prime is 66312383. The reversal of 66312377 is 77321366.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47554816 + 18757561 = 6896^2 + 4331^2 .

It is a cyclic number.

It is not a de Polignac number, because 66312377 - 2² = 66312373 is a prime.

It is not a weakly prime, because it can be changed into another prime (66312371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33156188 + 33156189.

It is an arithmetic number, because the mean of its divisors is an integer number (33156189).

Almost surely, 2^66312377 is an apocalyptic number.

It is an amenable number.

66312377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66312377 is an equidigital number, since it uses as much as digits as its factorization.

66312377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 35.

The square root of 66312377 is about 8143.2411851793. The cubic root of 66312377 is about 404.7605697538.

The spelling of 66312377 in words is "sixty-six million, three hundred twelve thousand, three hundred seventy-seven".