2161143770 has 16 divisors (see below), whose sum is σ = 3895131240. Its totient is φ = 863330304.

The previous prime is 2161143769. The next prime is 2161143797. The reversal of 2161143770 is 773411612.

It can be written as a sum of positive squares in 4 ways, for example, as 1316020729 + 845123041 = 36277^2 + 29071^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132827 + ... + 148206.

Almost surely, 2^2161143770 is an apocalyptic number.

2161143770 is a deficient number, since it is larger than the sum of its proper divisors (1733987470).

2161143770 is a wasteful number, since it uses less digits than its factorization.

2161143770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281809.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 2161143770 is about 46488.1035319790. The cubic root of 2161143770 is about 1292.8889383661. Note that the first 3 decimals are identical.

The spelling of 2161143770 in words is "two billion, one hundred sixty-one million, one hundred forty-three thousand, seven hundred seventy".