866788528272631 has 2 divisors, whose sum is σ = 866788528272632. Its totient is φ = 866788528272630.

The previous prime is 866788528272571. The next prime is 866788528272647. The reversal of 866788528272631 is 136272825887668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866788528272631 - 2²⁵ = 866788494718199 is a prime.

It is a super-2 number, since 2×866788528272631² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (866788528273631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433394264136315 + 433394264136316.

It is an arithmetic number, because the mean of its divisors is an integer number (433394264136316).

Almost surely, 2^{866788528272631} is an apocalyptic number.

866788528272631 is a deficient number, since it is larger than the sum of its proper divisors (1).

866788528272631 is an equidigital number, since it uses as much as digits as its factorization.

866788528272631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5202247680, while the sum is 79.

The spelling of 866788528272631 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-eight million, two hundred seventy-two thousand, six hundred thirty-one".