1918755883440 has 1800 divisors, whose sum is σ = 8055443845680. Its totient is φ = 421494036480.

The previous prime is 1918755883427. The next prime is 1918755883469. The reversal of 1918755883440 is 443885578191.

1918755883440 is a `hidden beast` number, since 1 + 9 + 1 + 8 + 7 + 5 + 588 + 3 + 4 + 40 = 666.

It is a super-2 number, since 2×1918755883440² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 359 ways as a sum of consecutive naturals, for example, 32521286131 + ... + 32521286189.

Almost surely, 2^{1918755883440} is an apocalyptic number.

1918755883440 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 1918755883440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4027721922840).

1918755883440 is an abundant number, since it is smaller than the sum of its proper divisors (6136687962240).

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

1918755883440 is a wasteful number, since it uses less digits than its factorization.

1918755883440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 38707200, while the sum is 63.

The spelling of 1918755883440 in words is "one trillion, nine hundred eighteen billion, seven hundred fifty-five million, eight hundred eighty-three thousand, four hundred forty".