66963769 has 2 divisors, whose sum is σ = 66963770. Its totient is φ = 66963768.

The previous prime is 66963763. The next prime is 66963773. The reversal of 66963769 is 96736966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64208169 + 2755600 = 8013^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 66963769 - 2⁷ = 66963641 is a prime.

It is a super-4 number, since 4×66963769⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (66963763) 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, 33481884 + 33481885.

It is an arithmetic number, because the mean of its divisors is an integer number (33481885).

Almost surely, 2^66963769 is an apocalyptic number.

It is an amenable number.

66963769 is a deficient number, since it is larger than the sum of its proper divisors (1).

66963769 is an equidigital number, since it uses as much as digits as its factorization.

66963769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 52.

The square root of 66963769 is about 8183.1393120245. The cubic root of 66963769 is about 406.0815859240.

The spelling of 66963769 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred sixty-nine".