866446233403651 has 2 divisors, whose sum is σ = 866446233403652. Its totient is φ = 866446233403650.

The previous prime is 866446233403643. The next prime is 866446233403693. The reversal of 866446233403651 is 156304332644668.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 866446233403651 - 2³ = 866446233403643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866446233403651.

It is not a weakly prime, because it can be changed into another prime (866446233403451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433223116701825 + 433223116701826.

It is an arithmetic number, because the mean of its divisors is an integer number (433223116701826).

Almost surely, 2^{866446233403651} is an apocalyptic number.

866446233403651 is a deficient number, since it is larger than the sum of its proper divisors (1).

866446233403651 is an equidigital number, since it uses as much as digits as its factorization.

866446233403651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 179159040, while the sum is 61.

The spelling of 866446233403651 in words is "eight hundred sixty-six trillion, four hundred forty-six billion, two hundred thirty-three million, four hundred three thousand, six hundred fifty-one".