66963773 has 2 divisors, whose sum is σ = 66963774. Its totient is φ = 66963772.

The previous prime is 66963769. The next prime is 66963779. The reversal of 66963773 is 37736966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55383364 + 11580409 = 7442^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 66963773 - 2² = 66963769 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66963779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33481886 + 33481887.

It is an arithmetic number, because the mean of its divisors is an integer number (33481887).

Almost surely, 2^66963773 is an apocalyptic number.

It is an amenable number.

66963773 is a deficient number, since it is larger than the sum of its proper divisors (1).

66963773 is an equidigital number, since it uses as much as digits as its factorization.

66963773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 47.

The square root of 66963773 is about 8183.1395564294. The cubic root of 66963773 is about 406.0815940096.

The spelling of 66963773 in words is "sixty-six million, nine hundred sixty-three thousand, seven hundred seventy-three".