18000072000072 has 60 divisors (see below), whose sum is σ = 50417170835955. Its totient is φ = 5999987999952.

The previous prime is 18000072000067. The next prime is 18000072000091. The reversal of 18000072000072 is 27000027000081.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9000036000036 + 9000036000036 = 3000006^2 + 3000006^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3000006.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 14 ways as a sum of consecutive naturals, for example, 107916883 + ... + 108083549.

Almost surely, 2^{18000072000072} is an apocalyptic number.

18000072000072 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18000072000072 is an abundant number, since it is smaller than the sum of its proper divisors (32417098835883).

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

18000072000072 is an frugal number, since it uses more digits than its factorization.

18000072000072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333352 (or 166672 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The spelling of 18000072000072 in words is "eighteen trillion, seventy-two million, seventy-two", and thus it is an aban number and an uban number.