8172806866 has 16 divisors (see below), whose sum is σ = 14028669504. Its totient is φ = 3498095664.

The previous prime is 8172806857. The next prime is 8172806869. The reversal of 8172806866 is 6686082718.

It is a super-3 number, since 3×8172806866³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (8172806869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366780 + ... + 388423.

It is an arithmetic number, because the mean of its divisors is an integer number (876791844).

Almost surely, 2^8172806866 is an apocalyptic number.

8172806866 is a deficient number, since it is larger than the sum of its proper divisors (5855862638).

8172806866 is a wasteful number, since it uses less digits than its factorization.

8172806866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755985.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The square root of 8172806866 is about 90403.5777278753. The cubic root of 8172806866 is about 2014.2981105960.

The spelling of 8172806866 in words is "eight billion, one hundred seventy-two million, eight hundred six thousand, eight hundred sixty-six".