8188163820 has 72 divisors (see below), whose sum is σ = 25093539744. Its totient is φ = 2160995328.

The previous prime is 8188163801. The next prime is 8188163843. The reversal of 8188163820 is 283618818.

8188163820 is a `hidden beast` number, since 8 + 1 + 8 + 8 + 1 + 638 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 217024 + ... + 251943.

Almost surely, 2^8188163820 is an apocalyptic number.

It is an amenable number.

8188163820 is an abundant number, since it is smaller than the sum of its proper divisors (16905375924).

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

8188163820 is a wasteful number, since it uses less digits than its factorization.

8188163820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469079 (or 469074 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 45.

The square root of 8188163820 is about 90488.4734096006. The cubic root of 8188163820 is about 2015.5589637785.

The spelling of 8188163820 in words is "eight billion, one hundred eighty-eight million, one hundred sixty-three thousand, eight hundred twenty".