1998712918368 has 480 divisors, whose sum is σ = 6199436095776. Its totient is φ = 630902587392.

The previous prime is 1998712918313. The next prime is 1998712918399. The reversal of 1998712918368 is 8638192178991.

It is a happy number.

1998712918368 is a `hidden beast` number, since 1 + 99 + 87 + 12 + 91 + 8 + 368 = 666.

It is a super-2 number, since 2×1998712918368² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 1998712918296 and 1998712918305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1455726130 + ... + 1455727502.

Almost surely, 2^{1998712918368} is an apocalyptic number.

1998712918368 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1998712918368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3099718047888).

1998712918368 is an abundant number, since it is smaller than the sum of its proper divisors (4200723177408).

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

1998712918368 is a wasteful number, since it uses less digits than its factorization.

1998712918368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1828 (or 1811 counting only the distinct ones).

The product of its digits is 94058496, while the sum is 72.

The spelling of 1998712918368 in words is "one trillion, nine hundred ninety-eight billion, seven hundred twelve million, nine hundred eighteen thousand, three hundred sixty-eight".