66905933 has 2 divisors, whose sum is σ = 66905934. Its totient is φ = 66905932.

The previous prime is 66905921. The next prime is 66905947. The reversal of 66905933 is 33950966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48260809 + 18645124 = 6947^2 + 4318^2 .

It is a cyclic number.

It is not a de Polignac number, because 66905933 - 2⁶ = 66905869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66905903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33452966 + 33452967.

It is an arithmetic number, because the mean of its divisors is an integer number (33452967).

Almost surely, 2^66905933 is an apocalyptic number.

It is an amenable number.

66905933 is a deficient number, since it is larger than the sum of its proper divisors (1).

66905933 is an equidigital number, since it uses as much as digits as its factorization.

66905933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 41.

The square root of 66905933 is about 8179.6046970499. The cubic root of 66905933 is about 405.9646425889.

The spelling of 66905933 in words is "sixty-six million, nine hundred five thousand, nine hundred thirty-three".