1997194644000 has 480 divisors, whose sum is σ = 7360826368896. Its totient is φ = 532564243200.

The previous prime is 1997194643993. The next prime is 1997194644013. The reversal of 1997194644000 is 4464917991.

1997194644000 is a `hidden beast` number, since 1 + 9 + 9 + 7 + 194 + 6 + 440 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

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

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, 78719317 + ... + 78744683.

Almost surely, 2^{1997194644000} is an apocalyptic number.

1997194644000 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 1997194644000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3680413184448).

1997194644000 is an abundant number, since it is smaller than the sum of its proper divisors (5363631724896).

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

1997194644000 is an frugal number, since it uses more digits than its factorization.

1997194644000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25419 (or 25377 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The spelling of 1997194644000 in words is "one trillion, nine hundred ninety-seven billion, one hundred ninety-four million, six hundred forty-four thousand".