1917163995040 has 768 divisors, whose sum is σ = 5846676111360. Its totient is φ = 579280896000.

The previous prime is 1917163995017. The next prime is 1917163995049. The reversal of 1917163995040 is 405993617191.

It is not an unprimeable number, because it can be changed into a prime (1917163995049) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1974421755 + ... + 1974422725.

It is an arithmetic number, because the mean of its divisors is an integer number (7612859520).

Almost surely, 2^{1917163995040} is an apocalyptic number.

1917163995040 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 1917163995040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2923338055680).

1917163995040 is an abundant number, since it is smaller than the sum of its proper divisors (3929512116320).

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

1917163995040 is a wasteful number, since it uses less digits than its factorization.

1917163995040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1157 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 1837080, while the sum is 55.

The spelling of 1917163995040 in words is "one trillion, nine hundred seventeen billion, one hundred sixty-three million, nine hundred ninety-five thousand, forty".