199994798640 has 640 divisors, whose sum is σ = 812420001792. Its totient is φ = 39494615040.

The previous prime is 199994798609. The next prime is 199994798671. The reversal of 199994798640 is 46897499991.

It is an interprime number because it is at equal distance from previous prime (199994798609) and next prime (199994798671).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 71655645 + ... + 71658435.

Almost surely, 2^199994798640 is an apocalyptic number.

199994798640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199994798640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (406210000896).

199994798640 is an abundant number, since it is smaller than the sum of its proper divisors (612425203152).

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

199994798640 is a wasteful number, since it uses less digits than its factorization.

199994798640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037 (or 3031 counting only the distinct ones).

The product of its (nonzero) digits is 317447424, while the sum is 75.

The spelling of 199994798640 in words is "one hundred ninety-nine billion, nine hundred ninety-four million, seven hundred ninety-eight thousand, six hundred forty".