671896593363681 has 36 divisors (see below), whose sum is σ = 1195379053272612. Its totient is φ = 361356151048704.

The previous prime is 671896593363617. The next prime is 671896593363701. The reversal of 671896593363681 is 186363395698176.

671896593363681 is a `hidden beast` number, since 6 + 7 + 1 + 8 + 96 + 5 + 93 + 363 + 6 + 81 = 666.

671896593363681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196890260634081 + 475006332729600 = 14031759^2 + 21794640^2 .

It is not a de Polignac number, because 671896593363681 - 2⁶ = 671896593363617 is a prime.

It is a super-2 number, since 2×671896593363681² (a number of 30 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 671896593363681.

It is not an unprimeable number, because it can be changed into a prime (671896593361681) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 44811023140 + ... + 44811038133.

It is an arithmetic number, because the mean of its divisors is an integer number (33204973702017).

Almost surely, 2^{671896593363681} is an apocalyptic number.

It is an amenable number.

671896593363681 is a deficient number, since it is larger than the sum of its proper divisors (523482459908931).

671896593363681 is a wasteful number, since it uses less digits than its factorization.

671896593363681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89622061310 (or 89622061300 counting only the distinct ones).

The product of its digits is 6348948480, while the sum is 81.

The spelling of 671896593363681 in words is "six hundred seventy-one trillion, eight hundred ninety-six billion, five hundred ninety-three million, three hundred sixty-three thousand, six hundred eighty-one".