1163821155840 has 720 divisors, whose sum is σ = 4699260165600. Its totient is φ = 265417850880.

The previous prime is 1163821155811. The next prime is 1163821155857. The reversal of 1163821155840 is 485511283611.

1163821155840 is a `hidden beast` number, since 1 + 1 + 6 + 3 + 82 + 11 + 558 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a super-2 number, since 2×1163821155840² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 676246180 + ... + 676247900.

It is an arithmetic number, because the mean of its divisors is an integer number (6526750230).

Almost surely, 2^{1163821155840} is an apocalyptic number.

1163821155840 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 1163821155840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2349630082800).

1163821155840 is an abundant number, since it is smaller than the sum of its proper divisors (3535439009760).

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

1163821155840 is a wasteful number, since it uses less digits than its factorization.

1163821155840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363 (or 2337 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 1163821155840 in words is "one trillion, one hundred sixty-three billion, eight hundred twenty-one million, one hundred fifty-five thousand, eight hundred forty".