66740747377 has 2 divisors, whose sum is σ = 66740747378. Its totient is φ = 66740747376.

The previous prime is 66740747357. The next prime is 66740747383. The reversal of 66740747377 is 77374704766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52016381041 + 14724366336 = 228071^2 + 121344^2 .

It is a cyclic number.

It is not a de Polignac number, because 66740747377 - 2³¹ = 64593263729 is a prime.

It is not a weakly prime, because it can be changed into another prime (66740747327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33370373688 + 33370373689.

It is an arithmetic number, because the mean of its divisors is an integer number (33370373689).

Almost surely, 2^66740747377 is an apocalyptic number.

It is an amenable number.

66740747377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66740747377 is an equidigital number, since it uses as much as digits as its factorization.

66740747377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29042496, while the sum is 58.

The spelling of 66740747377 in words is "sixty-six billion, seven hundred forty million, seven hundred forty-seven thousand, three hundred seventy-seven".