66016631 has 2 divisors, whose sum is σ = 66016632. Its totient is φ = 66016630.

The previous prime is 66016609. The next prime is 66016633. The reversal of 66016631 is 13661066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66016631 - 2¹⁴ = 66000247 is a prime.

It is a super-2 number, since 2×66016631² = 8716391137180322, which contains 22 as substring.

Together with 66016633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66016594 and 66016603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66016633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33008315 + 33008316.

It is an arithmetic number, because the mean of its divisors is an integer number (33008316).

Almost surely, 2^66016631 is an apocalyptic number.

66016631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66016631 is an equidigital number, since it uses as much as digits as its factorization.

66016631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66016631 is about 8125.0619074565. The cubic root of 66016631 is about 404.1579435866.

Adding to 66016631 its reverse (13661066), we get a palindrome (79677697).

The spelling of 66016631 in words is "sixty-six million, sixteen thousand, six hundred thirty-one".