198916028877 has 4 divisors (see below), whose sum is σ = 265221371840. Its totient is φ = 132610685916.

The previous prime is 198916028873. The next prime is 198916028897. The reversal of 198916028877 is 778820619891.

198916028877 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 198916028877 - 2² = 198916028873 is a prime.

It is a super-2 number, since 2×198916028877² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198916028873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33152671477 + ... + 33152671482.

It is an arithmetic number, because the mean of its divisors is an integer number (66305342960).

Almost surely, 2^198916028877 is an apocalyptic number.

It is an amenable number.

198916028877 is a deficient number, since it is larger than the sum of its proper divisors (66305342963).

198916028877 is an equidigital number, since it uses as much as digits as its factorization.

198916028877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66305342962.

The product of its (nonzero) digits is 24385536, while the sum is 66.

The spelling of 198916028877 in words is "one hundred ninety-eight billion, nine hundred sixteen million, twenty-eight thousand, eight hundred seventy-seven".