66798533 has 2 divisors, whose sum is σ = 66798534. Its totient is φ = 66798532.

The previous prime is 66798527. The next prime is 66798569. The reversal of 66798533 is 33589766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58721569 + 8076964 = 7663^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 66798533 - 2⁴ = 66798517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66798503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33399266 + 33399267.

It is an arithmetic number, because the mean of its divisors is an integer number (33399267).

Almost surely, 2^66798533 is an apocalyptic number.

It is an amenable number.

66798533 is a deficient number, since it is larger than the sum of its proper divisors (1).

66798533 is an equidigital number, since it uses as much as digits as its factorization.

66798533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 66798533 is about 8173.0369508525. The cubic root of 66798533 is about 405.7473028540.

The spelling of 66798533 in words is "sixty-six million, seven hundred ninety-eight thousand, five hundred thirty-three".