66963719 has 2 divisors, whose sum is σ = 66963720. Its totient is φ = 66963718.

The previous prime is 66963709. The next prime is 66963739. The reversal of 66963719 is 91736966.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66963719 is a prime.

It is a super-4 number, since 4×66963719⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66963709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33481859 + 33481860.

It is an arithmetic number, because the mean of its divisors is an integer number (33481860).

Almost surely, 2^66963719 is an apocalyptic number.

66963719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66963719 is an equidigital number, since it uses as much as digits as its factorization.

66963719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 66963719 is about 8183.1362569616. The cubic root of 66963719 is about 406.0814848540.

The spelling of 66963719 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred nineteen".