2161443504 has 320 divisors, whose sum is σ = 6687571968. Its totient is φ = 595123200.

The previous prime is 2161443503. The next prime is 2161443511. The reversal of 2161443504 is 4053441612.

It is not an unprimeable number, because it can be changed into a prime (2161443503) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26041447 + ... + 26041529.

Almost surely, 2^2161443504 is an apocalyptic number.

2161443504 is a gapful number since it is divisible by the number (24) 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 2161443504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3343785984).

2161443504 is an abundant number, since it is smaller than the sum of its proper divisors (4526128464).

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

2161443504 is a wasteful number, since it uses less digits than its factorization.

2161443504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 2161443504 is about 46491.3271912085. The cubic root of 2161443504 is about 1292.9487068498.

The spelling of 2161443504 in words is "two billion, one hundred sixty-one million, four hundred forty-three thousand, five hundred four".