199974748161 has 4 divisors (see below), whose sum is σ = 266632997552. Its totient is φ = 133316498772.

The previous prime is 199974748147. The next prime is 199974748229. The reversal of 199974748161 is 161847479991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 199974748161 - 2⁶ = 199974748097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199974748092 and 199974748101.

It is not an unprimeable number, because it can be changed into a prime (199974748661) 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, 33329124691 + ... + 33329124696.

It is an arithmetic number, because the mean of its divisors is an integer number (66658249388).

Almost surely, 2^199974748161 is an apocalyptic number.

It is an amenable number.

199974748161 is a deficient number, since it is larger than the sum of its proper divisors (66658249391).

199974748161 is an equidigital number, since it uses as much as digits as its factorization.

199974748161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66658249390.

The product of its digits is 27433728, while the sum is 66.

The spelling of 199974748161 in words is "one hundred ninety-nine billion, nine hundred seventy-four million, seven hundred forty-eight thousand, one hundred sixty-one".