8172561086 has 16 divisors (see below), whose sum is σ = 12905861760. Its totient is φ = 3870667800.

The previous prime is 8172561077. The next prime is 8172561091. The reversal of 8172561086 is 6801652718.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421865 + ... + 440811.

It is an arithmetic number, because the mean of its divisors is an integer number (806616360).

Almost surely, 2^8172561086 is an apocalyptic number.

8172561086 is a deficient number, since it is larger than the sum of its proper divisors (4733300674).

8172561086 is a wasteful number, since it uses less digits than its factorization.

8172561086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30319.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 8172561086 is about 90402.2183687989. The cubic root of 8172561086 is about 2014.2779184654.

The spelling of 8172561086 in words is "eight billion, one hundred seventy-two million, five hundred sixty-one thousand, eighty-six".