2161126642 has 8 divisors (see below), whose sum is σ = 3258145836. Its totient is φ = 1075078032.

The previous prime is 2161126631. The next prime is 2161126657. The reversal of 2161126642 is 2466211612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1748996041 + 412130601 = 41821^2 + 20301^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2742153 + ... + 2742940.

Almost surely, 2^2161126642 is an apocalyptic number.

2161126642 is a deficient number, since it is larger than the sum of its proper divisors (1097019194).

2161126642 is a wasteful number, since it uses less digits than its factorization.

2161126642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5485292.

The product of its digits is 6912, while the sum is 31.

The square root of 2161126642 is about 46487.9193124407. The cubic root of 2161126642 is about 1292.8855227889.

The spelling of 2161126642 in words is "two billion, one hundred sixty-one million, one hundred twenty-six thousand, six hundred forty-two".