866057623 has 2 divisors, whose sum is σ = 866057624. Its totient is φ = 866057622.

The previous prime is 866057597. The next prime is 866057627. The reversal of 866057623 is 326750668.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866057623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 866057623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866057627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433028811 + 433028812.

It is an arithmetic number, because the mean of its divisors is an integer number (433028812).

Almost surely, 2^866057623 is an apocalyptic number.

866057623 is a deficient number, since it is larger than the sum of its proper divisors (1).

866057623 is an equidigital number, since it uses as much as digits as its factorization.

866057623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 866057623 is about 29428.8569774635. The cubic root of 866057623 is about 953.1961134621.

The spelling of 866057623 in words is "eight hundred sixty-six million, fifty-seven thousand, six hundred twenty-three".