818198505 has 48 divisors (see below), whose sum is σ = 1439290944. Its totient is φ = 429936000.

The previous prime is 818198467. The next prime is 818198509. The reversal of 818198505 is 505891818.

It is not a de Polignac number, because 818198505 - 2⁷ = 818198377 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (818198509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1208227 + ... + 1208903.

It is an arithmetic number, because the mean of its divisors is an integer number (29985228).

Almost surely, 2^818198505 is an apocalyptic number.

It is an amenable number.

818198505 is a deficient number, since it is larger than the sum of its proper divisors (621092439).

818198505 is a wasteful number, since it uses less digits than its factorization.

818198505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1046 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 818198505 is about 28604.1693639232. The cubic root of 818198505 is about 935.3042200690.

The spelling of 818198505 in words is "eight hundred eighteen million, one hundred ninety-eight thousand, five hundred five".