66563611 has 2 divisors, whose sum is σ = 66563612. Its totient is φ = 66563610.

The previous prime is 66563599. The next prime is 66563617. The reversal of 66563611 is 11636566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66563611 - 2²¹ = 64466459 is a prime.

It is not a weakly prime, because it can be changed into another prime (66563617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281805 + 33281806.

It is an arithmetic number, because the mean of its divisors is an integer number (33281806).

Almost surely, 2^66563611 is an apocalyptic number.

66563611 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563611 is an equidigital number, since it uses as much as digits as its factorization.

66563611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 66563611 is about 8158.6525235482. The cubic root of 66563611 is about 405.2710901588.

The spelling of 66563611 in words is "sixty-six million, five hundred sixty-three thousand, six hundred eleven".