199730071836 has 72 divisors (see below), whose sum is σ = 551128730880. Its totient is φ = 63072648432.

The previous prime is 199730071811. The next prime is 199730071867. The reversal of 199730071836 is 638170037991.

199730071836 is a `hidden beast` number, since 199 + 7 + 300 + 71 + 83 + 6 = 666.

It is a super-2 number, since 2×199730071836² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

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, 5388996 + ... + 5425931.

Almost surely, 2^199730071836 is an apocalyptic number.

It is an amenable number.

199730071836 is an abundant number, since it is smaller than the sum of its proper divisors (351398659044).

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

199730071836 is a wasteful number, since it uses less digits than its factorization.

199730071836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10814965 (or 10814951 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The spelling of 199730071836 in words is "one hundred ninety-nine billion, seven hundred thirty million, seventy-one thousand, eight hundred thirty-six".