1855388447808 has 56 divisors (see below), whose sum is σ = 5610341262912. Its totient is φ = 530110984704.

The previous prime is 1855388447807. The next prime is 1855388447881. The reversal of 1855388447808 is 8087448835581.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1855388447807) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 690247335 + ... + 690250022.

Almost surely, 2^{1855388447808} is an apocalyptic number.

It is an amenable number.

1855388447808 is an abundant number, since it is smaller than the sum of its proper divisors (3754952815104).

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

1855388447808 is a wasteful number, since it uses less digits than its factorization.

1855388447808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380497379 (or 1380497369 counting only the distinct ones).

The product of its (nonzero) digits is 275251200, while the sum is 69.

The spelling of 1855388447808 in words is "one trillion, eight hundred fifty-five billion, three hundred eighty-eight million, four hundred forty-seven thousand, eight hundred eight".