66033631 has 2 divisors, whose sum is σ = 66033632. Its totient is φ = 66033630.

The previous prime is 66033587. The next prime is 66033691. The reversal of 66033631 is 13633066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66033631 - 2⁹ = 66033119 is a prime.

It is a super-2 number, since 2×66033631² = 8720880846088322, which contains 22 as substring.

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 66033631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66033691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33016815 + 33016816.

It is an arithmetic number, because the mean of its divisors is an integer number (33016816).

Almost surely, 2^66033631 is an apocalyptic number.

66033631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66033631 is an equidigital number, since it uses as much as digits as its factorization.

66033631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 28.

The square root of 66033631 is about 8126.1079859918. The cubic root of 66033631 is about 404.1926322969.

Adding to 66033631 its reverse (13633066), we get a palindrome (79666697).

The spelling of 66033631 in words is "sixty-six million, thirty-three thousand, six hundred thirty-one".