199994798641 has 16 divisors (see below), whose sum is σ = 220826286720. Its totient is φ = 179608682880.

The previous prime is 199994798609. The next prime is 199994798671. The reversal of 199994798641 is 146897499991.

It is not a de Polignac number, because 199994798641 - 2⁵ = 199994798609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199994798671) 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, 1002100 + ... + 1184986.

It is an arithmetic number, because the mean of its divisors is an integer number (13801642920).

Almost surely, 2^199994798641 is an apocalyptic number.

199994798641 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

199994798641 is a deficient number, since it is larger than the sum of its proper divisors (20831488079).

199994798641 is a wasteful number, since it uses less digits than its factorization.

199994798641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184104.

The product of its digits is 317447424, while the sum is 76.

The spelling of 199994798641 in words is "one hundred ninety-nine billion, nine hundred ninety-four million, seven hundred ninety-eight thousand, six hundred forty-one".