111998194506 has 32 divisors (see below), whose sum is σ = 271510776000. Its totient is φ = 33938846640.

The previous prime is 111998194499. The next prime is 111998194519. The reversal of 111998194506 is 605491899111.

111998194506 is a `hidden beast` number, since 1 + 119 + 9 + 8 + 19 + 4 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94273981 + ... + 94275168.

It is an arithmetic number, because the mean of its divisors is an integer number (8484711750).

Almost surely, 2^111998194506 is an apocalyptic number.

111998194506 is an abundant number, since it is smaller than the sum of its proper divisors (159512581494).

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

111998194506 is a wasteful number, since it uses less digits than its factorization.

111998194506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188549171 (or 188549165 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 54.

The spelling of 111998194506 in words is "one hundred eleven billion, nine hundred ninety-eight million, one hundred ninety-four thousand, five hundred six".