1643245121000 has 128 divisors (see below), whose sum is σ = 4395081600000. Its totient is φ = 563324659200.

The previous prime is 1643245120997. The next prime is 1643245121071. The reversal of 1643245121000 is 1215423461.

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, 101120876 + ... + 101137124.

It is an arithmetic number, because the mean of its divisors is an integer number (34336575000).

Almost surely, 2^{1643245121000} is an apocalyptic number.

1643245121000 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 1643245121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2197540800000).

1643245121000 is an abundant number, since it is smaller than the sum of its proper divisors (2751836479000).

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

1643245121000 is a wasteful number, since it uses less digits than its factorization.

1643245121000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30724 (or 30710 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The spelling of 1643245121000 in words is "one trillion, six hundred forty-three billion, two hundred forty-five million, one hundred twenty-one thousand".