66996633 has 16 divisors (see below), whose sum is σ = 98419392. Its totient is φ = 40200000.

The previous prime is 66996613. The next prime is 66996647. The reversal of 66996633 is 33669966.

It is not a de Polignac number, because 66996633 - 2⁶ = 66996569 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66996613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6718 + ... + 13383.

It is an arithmetic number, because the mean of its divisors is an integer number (6151212).

Almost surely, 2^66996633 is an apocalyptic number.

It is an amenable number.

66996633 is a deficient number, since it is larger than the sum of its proper divisors (31422759).

66996633 is a wasteful number, since it uses less digits than its factorization.

66996633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20216.

The product of its digits is 944784, while the sum is 48.

The square root of 66996633 is about 8185.1470970289. The cubic root of 66996633 is about 406.1480063324.

It can be divided in two parts, 66 and 996633, that added together give a palindrome (996699).

The spelling of 66996633 in words is "sixty-six million, nine hundred ninety-six thousand, six hundred thirty-three".