66733631 has 2 divisors, whose sum is σ = 66733632. Its totient is φ = 66733630.

The previous prime is 66733531. The next prime is 66733633. The reversal of 66733631 is 13633766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66733631 - 2¹⁰ = 66732607 is a prime.

It is a super-2 number, since 2×66733631² = 8906755012888322, which contains 22 as substring.

Together with 66733633, 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 = 66733591 and 66733600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66733633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33366815 + 33366816.

It is an arithmetic number, because the mean of its divisors is an integer number (33366816).

Almost surely, 2^66733631 is an apocalyptic number.

66733631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66733631 is an equidigital number, since it uses as much as digits as its factorization.

66733631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 35.

The square root of 66733631 is about 8169.0654912297. The cubic root of 66733631 is about 405.6158511409.

The spelling of 66733631 in words is "sixty-six million, seven hundred thirty-three thousand, six hundred thirty-one".