1803665961856 has 32 divisors (see below), whose sum is σ = 3919899039480. Its totient is φ = 819848163840.

The previous prime is 1803665961847. The next prime is 1803665961893. The reversal of 1803665961856 is 6581695663081.

It is a tau number, because it is divible by the number of its divisors (32).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640504971 + ... + 640507786.

Almost surely, 2^{1803665961856} is an apocalyptic number.

1803665961856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1803665961856 is an abundant number, since it is smaller than the sum of its proper divisors (2116233077624).

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

1803665961856 is a wasteful number, since it uses less digits than its factorization.

1803665961856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281012782 (or 1281012770 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 64.

The spelling of 1803665961856 in words is "one trillion, eight hundred three billion, six hundred sixty-five million, nine hundred sixty-one thousand, eight hundred fifty-six".