199044401779 has 8 divisors (see below), whose sum is σ = 200819628432. Its totient is φ = 197269416960.

The previous prime is 199044401771. The next prime is 199044401783. The reversal of 199044401779 is 977104440991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 199044401779 - 2³ = 199044401771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199044401771) 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, 1864899 + ... + 1968739.

It is an arithmetic number, because the mean of its divisors is an integer number (25102453554).

Almost surely, 2^199044401779 is an apocalyptic number.

199044401779 is a deficient number, since it is larger than the sum of its proper divisors (1775226653).

199044401779 is a wasteful number, since it uses less digits than its factorization.

199044401779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120917.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 199044401779 in words is "one hundred ninety-nine billion, forty-four million, four hundred one thousand, seven hundred seventy-nine".