2158189265 has 8 divisors (see below), whose sum is σ = 2596353000. Its totient is φ = 1722200832.

The previous prime is 2158189259. The next prime is 2158189303. The reversal of 2158189265 is 5629818512.

It can be written as a sum of positive squares in 4 ways, for example, as 327718609 + 1830470656 = 18103^2 + 42784^2 .

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 2158189265 - 2⁴ = 2158189249 is a prime.

It is a super-2 number, since 2×2158189265² = 9315561807122480450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541640 + ... + 545609.

It is an arithmetic number, because the mean of its divisors is an integer number (324544125).

Almost surely, 2^2158189265 is an apocalyptic number.

It is an amenable number.

2158189265 is a deficient number, since it is larger than the sum of its proper divisors (438163735).

2158189265 is a wasteful number, since it uses less digits than its factorization.

2158189265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087651.

The product of its digits is 345600, while the sum is 47.

The square root of 2158189265 is about 46456.3156632120. The cubic root of 2158189265 is about 1292.2994991200.

The spelling of 2158189265 in words is "two billion, one hundred fifty-eight million, one hundred eighty-nine thousand, two hundred sixty-five".