1980001801836 has 48 divisors (see below), whose sum is σ = 5184163162080. Its totient is φ = 653465937600.

The previous prime is 1980001801787. The next prime is 1980001801861. The reversal of 1980001801836 is 6381081000891.

It is a super-2 number, since 2×1980001801836² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1980001801791 and 1980001801800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90748251 + ... + 90770066.

It is an arithmetic number, because the mean of its divisors is an integer number (108003399210).

Almost surely, 2^{1980001801836} is an apocalyptic number.

It is an amenable number.

1980001801836 is an abundant number, since it is smaller than the sum of its proper divisors (3204161360244).

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

1980001801836 is a wasteful number, since it uses less digits than its factorization.

1980001801836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181518431 (or 181518423 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 1980001801836 in words is "one trillion, nine hundred eighty billion, one million, eight hundred one thousand, eight hundred thirty-six".