66854533 has 2 divisors, whose sum is σ = 66854534. Its totient is φ = 66854532.

The previous prime is 66854497. The next prime is 66854549. The reversal of 66854533 is 33545866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 806404 = 8127^2 + 898^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66854533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66854573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427266 + 33427267.

It is an arithmetic number, because the mean of its divisors is an integer number (33427267).

Almost surely, 2^66854533 is an apocalyptic number.

It is an amenable number.

66854533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854533 is an equidigital number, since it uses as much as digits as its factorization.

66854533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 259200, while the sum is 40.

The square root of 66854533 is about 8176.4621322428. The cubic root of 66854533 is about 405.8606561535.

The spelling of 66854533 in words is "sixty-six million, eight hundred fifty-four thousand, five hundred thirty-three".