199697989796990 has 8 divisors (see below), whose sum is σ = 359456381634600. Its totient is φ = 79879195918792.

The previous prime is 199697989796939. The next prime is 199697989796999. The reversal of 199697989796990 is 99697989796991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199697989796999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9984899489840 + ... + 9984899489859.

It is an arithmetic number, because the mean of its divisors is an integer number (44932047704325).

Almost surely, 2^{199697989796990} is an apocalyptic number.

199697989796990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

199697989796990 is a deficient number, since it is larger than the sum of its proper divisors (159758391837610).

199697989796990 is a wasteful number, since it uses less digits than its factorization.

199697989796990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19969798979706.

The product of its (nonzero) digits is 607475326752, while the sum is 107.

Subtracting from 199697989796990 its reverse (99697989796991), we obtain a palindrome (99999999999999).

The spelling of 199697989796990 in words is "one hundred ninety-nine trillion, six hundred ninety-seven billion, nine hundred eighty-nine million, seven hundred ninety-six thousand, nine hundred ninety".