199958991055 has 4 divisors (see below), whose sum is σ = 239950789272. Its totient is φ = 159967192840.

The previous prime is 199958991041. The next prime is 199958991077. The reversal of 199958991055 is 550199859991.

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

It is not a de Polignac number, because 199958991055 - 2¹⁷ = 199958859983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19995899101 + ... + 19995899110.

It is an arithmetic number, because the mean of its divisors is an integer number (59987697318).

Almost surely, 2^199958991055 is an apocalyptic number.

199958991055 is a deficient number, since it is larger than the sum of its proper divisors (39991798217).

199958991055 is an equidigital number, since it uses as much as digits as its factorization.

199958991055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39991798216.

The product of its (nonzero) digits is 59049000, while the sum is 70.

The spelling of 199958991055 in words is "one hundred ninety-nine billion, nine hundred fifty-eight million, nine hundred ninety-one thousand, fifty-five".