2001855021888 has 56 divisors (see below), whose sum is σ = 5467432011520. Its totient is φ = 645759682560.

The previous prime is 2001855021811. The next prime is 2001855021923. The reversal of 2001855021888 is 8881205581002.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168160633 + ... + 168172536.

Almost surely, 2^{2001855021888} is an apocalyptic number.

It is an amenable number.

2001855021888 is an abundant number, since it is smaller than the sum of its proper divisors (3465576989632).

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

2001855021888 is a wasteful number, since it uses less digits than its factorization.

2001855021888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336333215 (or 336333205 counting only the distinct ones).

The product of its (nonzero) digits is 409600, while the sum is 48.

The spelling of 2001855021888 in words is "two trillion, one billion, eight hundred fifty-five million, twenty-one thousand, eight hundred eighty-eight".