2161573456 has 180 divisors, whose sum is σ = 5334078240. Its totient is φ = 843696000.

The previous prime is 2161573451. The next prime is 2161573459. The reversal of 2161573456 is 6543751612.

Its product of digits (151200) is a multiple of the sum of its prime divisors (210).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161573451) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 14314981 + ... + 14315131.

It is an arithmetic number, because the mean of its divisors is an integer number (29633768).

Almost surely, 2^2161573456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2161573456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2667039120).

2161573456 is an abundant number, since it is smaller than the sum of its proper divisors (3172504784).

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

2161573456 is a wasteful number, since it uses less digits than its factorization.

2161573456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 210 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 2161573456 is about 46492.7247642037. The cubic root of 2161573456 is about 1292.9746182223.

The spelling of 2161573456 in words is "two billion, one hundred sixty-one million, five hundred seventy-three thousand, four hundred fifty-six".