66378670939277 has 2 divisors, whose sum is σ = 66378670939278. Its totient is φ = 66378670939276.

The previous prime is 66378670939271. The next prime is 66378670939319. The reversal of 66378670939277 is 77293907687366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35194722360196 + 31183948579081 = 5932514^2 + 5584259^2 .

It is a cyclic number.

It is not a de Polignac number, because 66378670939277 - 2¹⁰ = 66378670938253 is a prime.

It is a super-2 number, since 2×66378670939277² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66378670939271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33189335469638 + 33189335469639.

It is an arithmetic number, because the mean of its divisors is an integer number (33189335469639).

Almost surely, 2^{66378670939277} is an apocalyptic number.

It is an amenable number.

66378670939277 is a deficient number, since it is larger than the sum of its proper divisors (1).

66378670939277 is an equidigital number, since it uses as much as digits as its factorization.

66378670939277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6049137024, while the sum is 80.

The spelling of 66378670939277 in words is "sixty-six trillion, three hundred seventy-eight billion, six hundred seventy million, nine hundred thirty-nine thousand, two hundred seventy-seven".