1868503281920 has 432 divisors, whose sum is σ = 5222693863296. Its totient is φ = 635043840000.

The previous prime is 1868503281907. The next prime is 1868503281941. The reversal of 1868503281920 is 291823058681.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 614435600 + ... + 614438640.

It is an arithmetic number, because the mean of its divisors is an integer number (12089569128).

Almost surely, 2^{1868503281920} is an apocalyptic number.

1868503281920 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 1868503281920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2611346931648).

1868503281920 is an abundant number, since it is smaller than the sum of its proper divisors (3354190581376).

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

1868503281920 is a wasteful number, since it uses less digits than its factorization.

1868503281920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3258 (or 3227 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The spelling of 1868503281920 in words is "one trillion, eight hundred sixty-eight billion, five hundred three million, two hundred eighty-one thousand, nine hundred twenty".