8166931866 has 32 divisors (see below), whose sum is σ = 18456350400. Its totient is φ = 2676168720.

The previous prime is 8166931847. The next prime is 8166931891. The reversal of 8166931866 is 6681396618.

It is a super-2 number, since 2×8166931866² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1278505 + ... + 1284876.

It is an arithmetic number, because the mean of its divisors is an integer number (576760950).

Almost surely, 2^8166931866 is an apocalyptic number.

8166931866 is an abundant number, since it is smaller than the sum of its proper divisors (10289418534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8166931866 is a wasteful number, since it uses less digits than its factorization.

8166931866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2563451 (or 2563445 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 8166931866 is about 90371.0787033108. The cubic root of 8166931866 is about 2013.8153373236.

The spelling of 8166931866 in words is "eight billion, one hundred sixty-six million, nine hundred thirty-one thousand, eight hundred sixty-six".