199818198036 has 36 divisors (see below), whose sum is σ = 508951707264. Its totient is φ = 66097621200.

The previous prime is 199818198023. The next prime is 199818198049. The reversal of 199818198036 is 630891818991.

It is an interprime number because it is at equal distance from previous prime (199818198023) and next prime (199818198049).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×199818198036² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21180420 + ... + 21189851.

It is an arithmetic number, because the mean of its divisors is an integer number (14137547424).

Almost surely, 2^199818198036 is an apocalyptic number.

It is an amenable number.

199818198036 is an abundant number, since it is smaller than the sum of its proper divisors (309133509228).

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

199818198036 is a wasteful number, since it uses less digits than its factorization.

199818198036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42370412 (or 42370407 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 63.

The spelling of 199818198036 in words is "one hundred ninety-nine billion, eight hundred eighteen million, one hundred ninety-eight thousand, thirty-six".