8191665155 has 16 divisors (see below), whose sum is σ = 9875960640. Its totient is φ = 6522755712.

The previous prime is 8191665137. The next prime is 8191665161. The reversal of 8191665155 is 5515661918.

It is a cyclic number.

It is not a de Polignac number, because 8191665155 - 2²⁰ = 8190616579 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1148741 + ... + 1155849.

It is an arithmetic number, because the mean of its divisors is an integer number (617247540).

Almost surely, 2^8191665155 is an apocalyptic number.

8191665155 is a deficient number, since it is larger than the sum of its proper divisors (1684295485).

8191665155 is a wasteful number, since it uses less digits than its factorization.

8191665155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158.

The product of its digits is 324000, while the sum is 47.

The square root of 8191665155 is about 90507.8181982087. The cubic root of 8191665155 is about 2015.8462134248.

The spelling of 8191665155 in words is "eight billion, one hundred ninety-one million, six hundred sixty-five thousand, one hundred fifty-five".