198900074898 has 54 divisors (see below), whose sum is σ = 501342757461. Its totient is φ = 56824808544.

The previous prime is 198900074869. The next prime is 198900074909. The reversal of 198900074898 is 898470009891.

It can be written as a sum of positive squares in 2 ways, for example, as 193611440169 + 5288634729 = 440013^2 + 72723^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=315357.

It is a super-2 number, since 2×198900074898² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 13237486 + ... + 13252502.

Almost surely, 2^198900074898 is an apocalyptic number.

198900074898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

198900074898 is an abundant number, since it is smaller than the sum of its proper divisors (302442682563).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198900074898 is an frugal number, since it uses more digits than its factorization.

198900074898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30056 (or 15029 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 198900074898 in words is "one hundred ninety-eight billion, nine hundred million, seventy-four thousand, eight hundred ninety-eight".