199154180045 has 4 divisors (see below), whose sum is σ = 238985016060. Its totient is φ = 159323344032.

The previous prime is 199154179981. The next prime is 199154180081. The reversal of 199154180045 is 540081451991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 144952287076 + 54201892969 = 380726^2 + 232813^2 .

It is a cyclic number.

It is not a de Polignac number, because 199154180045 - 2⁶ = 199154179981 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19915418000 + ... + 19915418009.

It is an arithmetic number, because the mean of its divisors is an integer number (59746254015).

Almost surely, 2^199154180045 is an apocalyptic number.

It is an amenable number.

199154180045 is a deficient number, since it is larger than the sum of its proper divisors (39830836015).

199154180045 is an equidigital number, since it uses as much as digits as its factorization.

199154180045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39830836014.

The product of its (nonzero) digits is 259200, while the sum is 47.

The spelling of 199154180045 in words is "one hundred ninety-nine billion, one hundred fifty-four million, one hundred eighty thousand, forty-five".