2161342378 has 24 divisors (see below), whose sum is σ = 3684844548. Its totient is φ = 945036288.

The previous prime is 2161342373. The next prime is 2161342387. The reversal of 2161342378 is 8732431612.

It is a happy number.

2161342378 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2005517089 + 155825289 = 44783^2 + 12483^2 .

It is not an unprimeable number, because it can be changed into a prime (2161342373) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105751 + ... + 124522.

Almost surely, 2^2161342378 is an apocalyptic number.

2161342378 is a deficient number, since it is larger than the sum of its proper divisors (1523502170).

2161342378 is a wasteful number, since it uses less digits than its factorization.

2161342378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230326 (or 230307 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 2161342378 is about 46490.2395992965. The cubic root of 2161342378 is about 1292.9285424289.

The spelling of 2161342378 in words is "two billion, one hundred sixty-one million, three hundred forty-two thousand, three hundred seventy-eight".