18021202599044 has 48 divisors (see below), whose sum is σ = 33106284655920. Its totient is φ = 8576543139840.

The previous prime is 18021202599041. The next prime is 18021202599151. The reversal of 18021202599044 is 44099520212081.

It can be written as a sum of positive squares in 8 ways, for example, as 854977600 + 18020347621444 = 29240^2 + 4245038^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18021202599044.

It is not an unprimeable number, because it can be changed into a prime (18021202599041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8600729 + ... + 10488800.

It is an arithmetic number, because the mean of its divisors is an integer number (689714263665).

Almost surely, 2^{18021202599044} is an apocalyptic number.

It is an amenable number.

18021202599044 is a deficient number, since it is larger than the sum of its proper divisors (15085082056876).

18021202599044 is a wasteful number, since it uses less digits than its factorization.

18021202599044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19089720 (or 19089718 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 18021202599044 in words is "eighteen trillion, twenty-one billion, two hundred two million, five hundred ninety-nine thousand, forty-four".