66433612631 has 2 divisors, whose sum is σ = 66433612632. Its totient is φ = 66433612630.

The previous prime is 66433612603. The next prime is 66433612681. The reversal of 66433612631 is 13621633466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66433612631 is a prime.

It is a super-2 number, since 2×66433612631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66433612681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33216806315 + 33216806316.

It is an arithmetic number, because the mean of its divisors is an integer number (33216806316).

Almost surely, 2^66433612631 is an apocalyptic number.

66433612631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66433612631 is an equidigital number, since it uses as much as digits as its factorization.

66433612631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 41.

The spelling of 66433612631 in words is "sixty-six billion, four hundred thirty-three million, six hundred twelve thousand, six hundred thirty-one".