2161438705 has 8 divisors (see below), whose sum is σ = 2595700800. Its totient is φ = 1727834736.

The previous prime is 2161438673. The next prime is 2161438711. The reversal of 2161438705 is 5078341612.

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

It is a cyclic number.

It is not a de Polignac number, because 2161438705 - 2⁵ = 2161438673 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157275 + ... + 170464.

It is an arithmetic number, because the mean of its divisors is an integer number (324462600).

Almost surely, 2^2161438705 is an apocalyptic number.

It is an amenable number.

2161438705 is a deficient number, since it is larger than the sum of its proper divisors (434262095).

2161438705 is a wasteful number, since it uses less digits than its factorization.

2161438705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329063.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 2161438705 is about 46491.2755794031. The cubic root of 2161438705 is about 1292.9477499484.

The spelling of 2161438705 in words is "two billion, one hundred sixty-one million, four hundred thirty-eight thousand, seven hundred five".