1998149472000 has 2160 divisors, whose sum is σ = 8559305891136. Its totient is φ = 461666304000.

The previous prime is 1998149471987. The next prime is 1998149472001. The reversal of 1998149472000 is 2749418991.

1998149472000 is a `hidden beast` number, since 1 + 9 + 9 + 81 + 494 + 72 + 0 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2160).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998149472001) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 7213535862 + ... + 7213536138.

Almost surely, 2^{1998149472000} is an apocalyptic number.

1998149472000 is a gapful number since it is divisible by the number (10) 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 1998149472000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4279652945568).

1998149472000 is an abundant number, since it is smaller than the sum of its proper divisors (6561156419136).

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

1998149472000 is a wasteful number, since it uses less digits than its factorization.

1998149472000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 1998149472000 in words is "one trillion, nine hundred ninety-eight billion, one hundred forty-nine million, four hundred seventy-two thousand".