866611013 has 2 divisors, whose sum is σ = 866611014. Its totient is φ = 866611012.

The previous prime is 866611001. The next prime is 866611021. The reversal of 866611013 is 310116668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 668843044 + 197767969 = 25862^2 + 14063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866611013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866611063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433305506 + 433305507.

It is an arithmetic number, because the mean of its divisors is an integer number (433305507).

Almost surely, 2^866611013 is an apocalyptic number.

It is an amenable number.

866611013 is a deficient number, since it is larger than the sum of its proper divisors (1).

866611013 is an equidigital number, since it uses as much as digits as its factorization.

866611013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 866611013 is about 29438.2576420548. The cubic root of 866611013 is about 953.3990933686.

The spelling of 866611013 in words is "eight hundred sixty-six million, six hundred eleven thousand, thirteen".