1800180001980 has 36 divisors (see below), whose sum is σ = 5460546006552. Its totient is φ = 480048000480.

The previous prime is 1800180001931. The next prime is 1800180002003. The reversal of 1800180001980 is 891000810081.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5000499826 + ... + 5000500185.

Almost surely, 2^{1800180001980} is an apocalyptic number.

1800180001980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1800180001980 is an abundant number, since it is smaller than the sum of its proper divisors (3660366004572).

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

1800180001980 is a wasteful number, since it uses less digits than its factorization.

1800180001980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10001000026 (or 10001000021 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The spelling of 1800180001980 in words is "one trillion, eight hundred billion, one hundred eighty million, one thousand, nine hundred eighty".