2161944357 has 8 divisors (see below), whose sum is σ = 2883935040. Its totient is φ = 1440624960.

The previous prime is 2161944347. The next prime is 2161944377. The reversal of 2161944357 is 7534491612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2161944357 - 2⁶ = 2161944293 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161944347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160257 + ... + 173222.

It is an arithmetic number, because the mean of its divisors is an integer number (360491880).

Almost surely, 2^2161944357 is an apocalyptic number.

It is an amenable number.

2161944357 is a deficient number, since it is larger than the sum of its proper divisors (721990683).

2161944357 is a wasteful number, since it uses less digits than its factorization.

2161944357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335643.

The product of its digits is 181440, while the sum is 42.

The square root of 2161944357 is about 46496.7133999813. The cubic root of 2161944357 is about 1293.0485671553.

The spelling of 2161944357 in words is "two billion, one hundred sixty-one million, nine hundred forty-four thousand, three hundred fifty-seven".