866761280451631 has 2 divisors, whose sum is σ = 866761280451632. Its totient is φ = 866761280451630.

The previous prime is 866761280451581. The next prime is 866761280451641. The reversal of 866761280451631 is 136154082167668.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 866761280451631 - 2¹¹ = 866761280449583 is a prime.

It is a super-2 number, since 2×866761280451631² (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 (866761280451641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433380640225815 + 433380640225816.

It is an arithmetic number, because the mean of its divisors is an integer number (433380640225816).

Almost surely, 2^{866761280451631} is an apocalyptic number.

866761280451631 is a deficient number, since it is larger than the sum of its proper divisors (1).

866761280451631 is an equidigital number, since it uses as much as digits as its factorization.

866761280451631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 866761280451631 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred eighty million, four hundred fifty-one thousand, six hundred thirty-one".