66657733 has 2 divisors, whose sum is σ = 66657734. Its totient is φ = 66657732.

The previous prime is 66657713. The next prime is 66657737. The reversal of 66657733 is 33775666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61121124 + 5536609 = 7818^2 + 2353^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66657733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66657733.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66657737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33328866 + 33328867.

It is an arithmetic number, because the mean of its divisors is an integer number (33328867).

Almost surely, 2^66657733 is an apocalyptic number.

It is an amenable number.

66657733 is a deficient number, since it is larger than the sum of its proper divisors (1).

66657733 is an equidigital number, since it uses as much as digits as its factorization.

66657733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 43.

The square root of 66657733 is about 8164.4187178268. The cubic root of 66657733 is about 405.4620201074.

The spelling of 66657733 in words is "sixty-six million, six hundred fifty-seven thousand, seven hundred thirty-three".