66260993 has 2 divisors, whose sum is σ = 66260994. Its totient is φ = 66260992.

The previous prime is 66260983. The next prime is 66261007. The reversal of 66260993 is 39906266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61905424 + 4355569 = 7868^2 + 2087^2 .

It is a cyclic number.

It is not a de Polignac number, because 66260993 - 2⁴ = 66260977 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66260993.

It is not a weakly prime, because it can be changed into another prime (66260933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33130496 + 33130497.

It is an arithmetic number, because the mean of its divisors is an integer number (33130497).

Almost surely, 2^66260993 is an apocalyptic number.

It is an amenable number.

66260993 is a deficient number, since it is larger than the sum of its proper divisors (1).

66260993 is an equidigital number, since it uses as much as digits as its factorization.

66260993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 66260993 is about 8140.0855646609. The cubic root of 66260993 is about 404.6559960558.

The spelling of 66260993 in words is "sixty-six million, two hundred sixty thousand, nine hundred ninety-three".