1165039985880 has 384 divisors, whose sum is σ = 3927026188800. Its totient is φ = 299349743616.

The previous prime is 1165039985839. The next prime is 1165039985953. The reversal of 1165039985880 is 885899305611.

1165039985880 is a `hidden beast` number, since 1 + 16 + 5 + 0 + 39 + 9 + 8 + 588 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 891384187 + ... + 891385493.

It is an arithmetic number, because the mean of its divisors is an integer number (10226630700).

Almost surely, 2^{1165039985880} is an apocalyptic number.

1165039985880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165039985880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1963513094400).

1165039985880 is an abundant number, since it is smaller than the sum of its proper divisors (2761986202920).

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

1165039985880 is a wasteful number, since it uses less digits than its factorization.

1165039985880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103 (or 2096 counting only the distinct ones).

The product of its (nonzero) digits is 18662400, while the sum is 63.

The spelling of 1165039985880 in words is "one trillion, one hundred sixty-five billion, thirty-nine million, nine hundred eighty-five thousand, eight hundred eighty".