66085801 has 2 divisors, whose sum is σ = 66085802. Its totient is φ = 66085800.

The previous prime is 66085787. The next prime is 66085823. The reversal of 66085801 is 10858066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57229225 + 8856576 = 7565^2 + 2976^2 .

It is a cyclic number.

It is not a de Polignac number, because 66085801 - 2²³ = 57697193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66085871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33042900 + 33042901.

It is an arithmetic number, because the mean of its divisors is an integer number (33042901).

Almost surely, 2^66085801 is an apocalyptic number.

It is an amenable number.

66085801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66085801 is an equidigital number, since it uses as much as digits as its factorization.

66085801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 66085801 is about 8129.3173760163. The cubic root of 66085801 is about 404.2990486716.

The spelling of 66085801 in words is "sixty-six million, eighty-five thousand, eight hundred one".