66963779 has 2 divisors, whose sum is σ = 66963780. Its totient is φ = 66963778.

The previous prime is 66963773. The next prime is 66963781. The reversal of 66963779 is 97736966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66963779 - 2⁴ = 66963763 is a prime.

Together with 66963781, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66963779.

It is not a weakly prime, because it can be changed into another prime (66963773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33481889 + 33481890.

It is an arithmetic number, because the mean of its divisors is an integer number (33481890).

Almost surely, 2^66963779 is an apocalyptic number.

66963779 is a deficient number, since it is larger than the sum of its proper divisors (1).

66963779 is an equidigital number, since it uses as much as digits as its factorization.

66963779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 53.

The square root of 66963779 is about 8183.1399230369. The cubic root of 66963779 is about 406.0816061380.

The spelling of 66963779 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred seventy-nine".