1165983663820 has 48 divisors (see below), whose sum is σ = 2543047073280. Its totient is φ = 448733395904.

The previous prime is 1165983663787. The next prime is 1165983663821. The reversal of 1165983663820 is 283663895611.

It is a super-2 number, since 2×1165983663820² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1165983663821) 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, 10456474 + ... + 10567393.

It is an arithmetic number, because the mean of its divisors is an integer number (52980147360).

Almost surely, 2^{1165983663820} is an apocalyptic number.

1165983663820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1165983663820 is an abundant number, since it is smaller than the sum of its proper divisors (1377063409460).

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

1165983663820 is a wasteful number, since it uses less digits than its factorization.

1165983663820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21023982 (or 21023980 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 58.

The spelling of 1165983663820 in words is "one trillion, one hundred sixty-five billion, nine hundred eighty-three million, six hundred sixty-three thousand, eight hundred twenty".