1161845209840 has 160 divisors (see below), whose sum is σ = 3165855943680. Its totient is φ = 388322457600.

The previous prime is 1161845209823. The next prime is 1161845209867. The reversal of 1161845209840 is 489025481611.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3374475 + ... + 3702805.

It is an arithmetic number, because the mean of its divisors is an integer number (19786599648).

Almost surely, 2^{1161845209840} is an apocalyptic number.

1161845209840 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 1161845209840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582927971840).

1161845209840 is an abundant number, since it is smaller than the sum of its proper divisors (2004010733840).

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

1161845209840 is a wasteful number, since it uses less digits than its factorization.

1161845209840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328511 (or 328505 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 49.

The spelling of 1161845209840 in words is "one trillion, one hundred sixty-one billion, eight hundred forty-five million, two hundred nine thousand, eight hundred forty".