199129942978561 has 8 divisors (see below), whose sum is σ = 227577473535744. Its totient is φ = 170682511382880.

The previous prime is 199129942978541. The next prime is 199129942978573. The reversal of 199129942978561 is 165879249921991.

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

It is not a de Polignac number, because 199129942978561 - 2¹¹ = 199129942976513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199129942978541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20377225 + ... + 28521766.

It is an arithmetic number, because the mean of its divisors is an integer number (28447184191968).

Almost surely, 2^{199129942978561} is an apocalyptic number.

It is an amenable number.

199129942978561 is a deficient number, since it is larger than the sum of its proper divisors (28447530557183).

199129942978561 is an equidigital number, since it uses as much as digits as its factorization.

199129942978561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49480751.

The product of its digits is 1587237120, while the sum is 82.

The spelling of 199129942978561 in words is "one hundred ninety-nine trillion, one hundred twenty-nine billion, nine hundred forty-two million, nine hundred seventy-eight thousand, five hundred sixty-one".