8161691746 has 24 divisors (see below), whose sum is σ = 13289992164. Its totient is φ = 3757478400.

The previous prime is 8161691693. The next prime is 8161691761. The reversal of 8161691746 is 6471961618.

It can be written as a sum of positive squares in 6 ways, for example, as 1008761121 + 7152930625 = 31761^2 + 84575^2 .

It is a super-2 number, since 2×8161691746² (a number of 21 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 8161691746.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105430 + ... + 165646.

Almost surely, 2^8161691746 is an apocalyptic number.

8161691746 is a deficient number, since it is larger than the sum of its proper divisors (5128300418).

8161691746 is a wasteful number, since it uses less digits than its factorization.

8161691746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60646 (or 60633 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 8161691746 is about 90342.0818113021. The cubic root of 8161691746 is about 2013.3845394037.

The spelling of 8161691746 in words is "eight billion, one hundred sixty-one million, six hundred ninety-one thousand, seven hundred forty-six".