198914457918 has 32 divisors (see below), whose sum is σ = 444088098432. Its totient is φ = 58875314400.

The previous prime is 198914457883. The next prime is 198914457919. The reversal of 198914457918 is 819754419891.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198914457919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35041993 + ... + 35047668.

It is an arithmetic number, because the mean of its divisors is an integer number (13877753076).

Almost surely, 2^198914457918 is an apocalyptic number.

198914457918 is an abundant number, since it is smaller than the sum of its proper divisors (245173640514).

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

198914457918 is a wasteful number, since it uses less digits than its factorization.

198914457918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70089720.

The product of its digits is 26127360, while the sum is 66.

The spelling of 198914457918 in words is "one hundred ninety-eight billion, nine hundred fourteen million, four hundred fifty-seven thousand, nine hundred eighteen".