66336631 has 2 divisors, whose sum is σ = 66336632. Its totient is φ = 66336630.

The previous prime is 66336629. The next prime is 66336643. The reversal of 66336631 is 13663366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66336631 - 2¹ = 66336629 is a prime.

It is a super-2 number, since 2×66336631² = 8801097224860322, which contains 22 as substring.

Together with 66336629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66336661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33168315 + 33168316.

It is an arithmetic number, because the mean of its divisors is an integer number (33168316).

Almost surely, 2^66336631 is an apocalyptic number.

66336631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66336631 is an equidigital number, since it uses as much as digits as its factorization.

66336631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34992, while the sum is 34.

The square root of 66336631 is about 8144.7302594991. The cubic root of 66336631 is about 404.8099113030.

Adding to 66336631 its reverse (13663366), we get a palindrome (79999997).

The spelling of 66336631 in words is "sixty-six million, three hundred thirty-six thousand, six hundred thirty-one".