2165651643 has 8 divisors (see below), whose sum is σ = 2888424000. Its totient is φ = 1443323528.

The previous prime is 2165651633. The next prime is 2165651651. The reversal of 2165651643 is 3461565612.

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 2165651643 - 2⁴ = 2165651627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165651633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99513 + ... + 119306.

It is an arithmetic number, because the mean of its divisors is an integer number (361053000).

Almost surely, 2^2165651643 is an apocalyptic number.

2165651643 is a deficient number, since it is larger than the sum of its proper divisors (722772357).

2165651643 is a wasteful number, since it uses less digits than its factorization.

2165651643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222121.

The product of its digits is 129600, while the sum is 39.

The square root of 2165651643 is about 46536.5624321350. The cubic root of 2165651643 is about 1293.7872484223.

The spelling of 2165651643 in words is "two billion, one hundred sixty-five million, six hundred fifty-one thousand, six hundred forty-three".