866051852571623 has 2 divisors, whose sum is σ = 866051852571624. Its totient is φ = 866051852571622.

The previous prime is 866051852571599. The next prime is 866051852571629. The reversal of 866051852571623 is 326175258150668.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866051852571623 - 2³⁰ = 866050778829799 is a prime.

It is a super-2 number, since 2×866051852571623² (a number of 31 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866051852571623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866051852571629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433025926285811 + 433025926285812.

It is an arithmetic number, because the mean of its divisors is an integer number (433025926285812).

Almost surely, 2^{866051852571623} is an apocalyptic number.

866051852571623 is a deficient number, since it is larger than the sum of its proper divisors (1).

866051852571623 is an equidigital number, since it uses as much as digits as its factorization.

866051852571623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152000, while the sum is 65.

The spelling of 866051852571623 in words is "eight hundred sixty-six trillion, fifty-one billion, eight hundred fifty-two million, five hundred seventy-one thousand, six hundred twenty-three".