66447833 has 2 divisors, whose sum is σ = 66447834. Its totient is φ = 66447832.

The previous prime is 66447827. The next prime is 66447859. The reversal of 66447833 is 33874466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45535504 + 20912329 = 6748^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 66447833 - 2¹⁸ = 66185689 is a prime.

It is not a weakly prime, because it can be changed into another prime (66447803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33223916 + 33223917.

It is an arithmetic number, because the mean of its divisors is an integer number (33223917).

Almost surely, 2^66447833 is an apocalyptic number.

It is an amenable number.

66447833 is a deficient number, since it is larger than the sum of its proper divisors (1).

66447833 is an equidigital number, since it uses as much as digits as its factorization.

66447833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 41.

The square root of 66447833 is about 8151.5540236203. The cubic root of 66447833 is about 405.0359831871.

The spelling of 66447833 in words is "sixty-six million, four hundred forty-seven thousand, eight hundred thirty-three".