1981837983636 has 72 divisors (see below), whose sum is σ = 5864951461824. Its totient is φ = 552428703360.

The previous prime is 1981837983613. The next prime is 1981837983679. The reversal of 1981837983636 is 6363897381891.

1981837983636 is a `hidden beast` number, since 19 + 8 + 183 + 79 + 8 + 363 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95897430 + ... + 95918093.

It is an arithmetic number, because the mean of its divisors is an integer number (81457659192).

Almost surely, 2^{1981837983636} is an apocalyptic number.

It is an amenable number.

1981837983636 is an abundant number, since it is smaller than the sum of its proper divisors (3883113478188).

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

1981837983636 is a wasteful number, since it uses less digits than its factorization.

1981837983636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191815581 (or 191815576 counting only the distinct ones).

The product of its digits is 282175488, while the sum is 72.

The spelling of 1981837983636 in words is "one trillion, nine hundred eighty-one billion, eight hundred thirty-seven million, nine hundred eighty-three thousand, six hundred thirty-six".