2161434545 has 32 divisors (see below), whose sum is σ = 2802401280. Its totient is φ = 1595689920.

The previous prime is 2161434523. The next prime is 2161434557. The reversal of 2161434545 is 5454341612.

2161434545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2161434545 - 2¹² = 2161430449 is a prime.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1493012 + ... + 1494458.

It is an arithmetic number, because the mean of its divisors is an integer number (87575040).

Almost surely, 2^2161434545 is an apocalyptic number.

It is an amenable number.

2161434545 is a deficient number, since it is larger than the sum of its proper divisors (640966735).

2161434545 is a wasteful number, since it uses less digits than its factorization.

2161434545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925.

The product of its digits is 57600, while the sum is 35.

The square root of 2161434545 is about 46491.2308398046. The cubic root of 2161434545 is about 1292.9469204598.

The spelling of 2161434545 in words is "two billion, one hundred sixty-one million, four hundred thirty-four thousand, five hundred forty-five".