199022028779 has 4 divisors (see below), whose sum is σ = 227453747184. Its totient is φ = 170590310376.

The previous prime is 199022028769. The next prime is 199022028781. The reversal of 199022028779 is 977820220991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977820220991 = 47 ⋅20804685553.

It is a cyclic number.

It is not a de Polignac number, because 199022028779 - 2¹⁶ = 199021963243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199022028719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14215859192 + ... + 14215859205.

It is an arithmetic number, because the mean of its divisors is an integer number (56863436796).

Almost surely, 2^199022028779 is an apocalyptic number.

199022028779 is a deficient number, since it is larger than the sum of its proper divisors (28431718405).

199022028779 is an equidigital number, since it uses as much as digits as its factorization.

199022028779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28431718404.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 199022028779 in words is "one hundred ninety-nine billion, twenty-two million, twenty-eight thousand, seven hundred seventy-nine".