191998119456 has 144 divisors (see below), whose sum is σ = 641448400320. Its totient is φ = 53705756160.

The previous prime is 191998119451. The next prime is 191998119457. The reversal of 191998119456 is 654911899191.

It is a happy number.

191998119456 is a `hidden beast` number, since 1 + 9 + 1 + 99 + 81 + 19 + 456 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 191998119393 and 191998119402.

It is not an unprimeable number, because it can be changed into a prime (191998119451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2289796 + ... + 2372163.

It is an arithmetic number, because the mean of its divisors is an integer number (4454502780).

Almost surely, 2^191998119456 is an apocalyptic number.

191998119456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

191998119456 is an abundant number, since it is smaller than the sum of its proper divisors (449450280864).

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

191998119456 is a wasteful number, since it uses less digits than its factorization.

191998119456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661999 (or 4661988 counting only the distinct ones).

The product of its digits is 6298560, while the sum is 63.

The spelling of 191998119456 in words is "one hundred ninety-one billion, nine hundred ninety-eight million, one hundred nineteen thousand, four hundred fifty-six".