1918803056640 has 384 divisors, whose sum is σ = 6503226912000. Its totient is φ = 481639661568.

The previous prime is 1918803056633. The next prime is 1918803056641. The reversal of 1918803056640 is 466503088191.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918803056641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91627291 + ... + 91648229.

It is an arithmetic number, because the mean of its divisors is an integer number (16935486750).

Almost surely, 2^{1918803056640} is an apocalyptic number.

1918803056640 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 1918803056640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3251613456000).

1918803056640 is an abundant number, since it is smaller than the sum of its proper divisors (4584423855360).

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

1918803056640 is a wasteful number, since it uses less digits than its factorization.

1918803056640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21145 (or 21125 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 51.

The spelling of 1918803056640 in words is "one trillion, nine hundred eighteen billion, eight hundred three million, fifty-six thousand, six hundred forty".