8168190861 has 16 divisors (see below), whose sum is σ = 11153482560. Its totient is φ = 5314391040.

The previous prime is 8168190851. The next prime is 8168190869. The reversal of 8168190861 is 1680918618.

It is not a de Polignac number, because 8168190861 - 2⁷ = 8168190733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8168190861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8168190869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132781 + ... + 184301.

It is an arithmetic number, because the mean of its divisors is an integer number (697092660).

Almost surely, 2^8168190861 is an apocalyptic number.

It is an amenable number.

8168190861 is a deficient number, since it is larger than the sum of its proper divisors (2985291699).

8168190861 is a wasteful number, since it uses less digits than its factorization.

8168190861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52796.

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 8168190861 is about 90378.0441313044. The cubic root of 8168190861 is about 2013.9188136846.

The spelling of 8168190861 in words is "eight billion, one hundred sixty-eight million, one hundred ninety thousand, eight hundred sixty-one".