1165403643840 has 336 divisors, whose sum is σ = 4367360632800. Its totient is φ = 292492836864.

The previous prime is 1165403643829. The next prime is 1165403643893. The reversal of 1165403643840 is 483463045611.

1165403643840 is a `hidden beast` number, since 1 + 1 + 6 + 540 + 3 + 64 + 3 + 8 + 40 = 666.

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 47 ways as a sum of consecutive naturals, for example, 2263596 + ... + 2730324.

Almost surely, 2^{1165403643840} is an apocalyptic number.

1165403643840 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 1165403643840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2183680316400).

1165403643840 is an abundant number, since it is smaller than the sum of its proper divisors (3201956988960).

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

1165403643840 is a wasteful number, since it uses less digits than its factorization.

1165403643840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466789 (or 466756 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 45.

The spelling of 1165403643840 in words is "one trillion, one hundred sixty-five billion, four hundred three million, six hundred forty-three thousand, eight hundred forty".