199857120001 has 16 divisors (see below), whose sum is σ = 257210339328. Its totient is φ = 150709179600.

The previous prime is 199857119999. The next prime is 199857120019. The reversal of 199857120001 is 100021758991.

It is not a de Polignac number, because 199857120001 - 2¹ = 199857119999 is a prime.

It is a super-2 number, since 2×199857120001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 199857120001.

It is not an unprimeable number, because it can be changed into a prime (199857120061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41861275 + ... + 41866048.

It is an arithmetic number, because the mean of its divisors is an integer number (16075646208).

Almost surely, 2^199857120001 is an apocalyptic number.

199857120001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199857120001 is a deficient number, since it is larger than the sum of its proper divisors (57353219327).

199857120001 is a wasteful number, since it uses less digits than its factorization.

199857120001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83727372.

The product of its (nonzero) digits is 45360, while the sum is 43.

Adding to 199857120001 its reverse (100021758991), we get a palindrome (299878878992).

The spelling of 199857120001 in words is "one hundred ninety-nine billion, eight hundred fifty-seven million, one hundred twenty thousand, one".