168697445556571 has 4 divisors (see below), whose sum is σ = 168772388893144. Its totient is φ = 168622502220000.

The previous prime is 168697445556557. The next prime is 168697445556617. The reversal of 168697445556571 is 175655544796861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168697445556571 is a prime.

It is a super-2 number, since 2×168697445556571² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168697445556491 and 168697445556500.

It is not an unprimeable number, because it can be changed into a prime (168697485556571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37471664910 + ... + 37471669411.

It is an arithmetic number, because the mean of its divisors is an integer number (42193097223286).

Almost surely, 2^{168697445556571} is an apocalyptic number.

168697445556571 is a deficient number, since it is larger than the sum of its proper divisors (74943336573).

168697445556571 is an equidigital number, since it uses as much as digits as its factorization.

168697445556571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74943336572.

The product of its digits is 7620480000, while the sum is 79.

The spelling of 168697445556571 in words is "one hundred sixty-eight trillion, six hundred ninety-seven billion, four hundred forty-five million, five hundred fifty-six thousand, five hundred seventy-one".