866788774308623 has 48 divisors (see below), whose sum is σ = 956189958909120. Its totient is φ = 784145149083648.

The previous prime is 866788774308619. The next prime is 866788774308703. The reversal of 866788774308623 is 326803477887668.

It is not a de Polignac number, because 866788774308623 - 2² = 866788774308619 is a prime.

It is a super-2 number, since 2×866788774308623² (a number of 31 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866788771308623) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20771835023 + ... + 20771876751.

It is an arithmetic number, because the mean of its divisors is an integer number (19920624143940).

Almost surely, 2^{866788774308623} is an apocalyptic number.

866788774308623 is a deficient number, since it is larger than the sum of its proper divisors (89401184600497).

866788774308623 is a wasteful number, since it uses less digits than its factorization.

866788774308623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45936 (or 45917 counting only the distinct ones).

The product of its (nonzero) digits is 21849440256, while the sum is 83.

The spelling of 866788774308623 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, seven hundred seventy-four million, three hundred eight thousand, six hundred twenty-three".