866802166204625 has 96 divisors (see below), whose sum is σ = 1323117658755360. Its totient is φ = 564474891456000.

The previous prime is 866802166204607. The next prime is 866802166204687. The reversal of 866802166204625 is 526402661208668.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 866802098899009 + 67305616 = 29441503^2 + 8204^2 .

It is not a de Polignac number, because 866802166204625 - 2⁶ = 866802166204561 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29164514 + ... + 50834763.

It is an arithmetic number, because the mean of its divisors is an integer number (13782475612035).

Almost surely, 2^{866802166204625} is an apocalyptic number.

It is an amenable number.

866802166204625 is a deficient number, since it is larger than the sum of its proper divisors (456315492550735).

866802166204625 is a wasteful number, since it uses less digits than its factorization.

866802166204625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79999396 (or 79999379 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 62.

The spelling of 866802166204625 in words is "eight hundred sixty-six trillion, eight hundred two billion, one hundred sixty-six million, two hundred four thousand, six hundred twenty-five".