66767633 has 2 divisors, whose sum is σ = 66767634. Its totient is φ = 66767632.

The previous prime is 66767629. The next prime is 66767641. The reversal of 66767633 is 33676766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63552784 + 3214849 = 7972^2 + 1793^2 .

It is a cyclic number.

It is not a de Polignac number, because 66767633 - 2² = 66767629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66767663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383816 + 33383817.

It is an arithmetic number, because the mean of its divisors is an integer number (33383817).

Almost surely, 2^66767633 is an apocalyptic number.

It is an amenable number.

66767633 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767633 is an equidigital number, since it uses as much as digits as its factorization.

66767633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 44.

The square root of 66767633 is about 8171.1463700022. The cubic root of 66767633 is about 405.6847289978.

It can be divided in two parts, 6676763 and 3, that added together give a palindrome (6676766).

The spelling of 66767633 in words is "sixty-six million, seven hundred sixty-seven thousand, six hundred thirty-three".