2155523065 has 8 divisors (see below), whose sum is σ = 2605509000. Its totient is φ = 1711830912.

The previous prime is 2155523063. The next prime is 2155523081. The reversal of 2155523065 is 5603255512.

It can be written as a sum of positive squares in 4 ways, for example, as 141039376 + 2014483689 = 11876^2 + 44883^2 .

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 2155523065 - 2¹ = 2155523063 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2155523065.

It is not an unprimeable number, because it can be changed into a prime (2155523063) by changing a digit.

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, 1572690 + ... + 1574059.

It is an arithmetic number, because the mean of its divisors is an integer number (325688625).

Almost surely, 2^2155523065 is an apocalyptic number.

It is an amenable number.

2155523065 is a deficient number, since it is larger than the sum of its proper divisors (449985935).

2155523065 is a wasteful number, since it uses less digits than its factorization.

2155523065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3146891.

The product of its (nonzero) digits is 45000, while the sum is 34.

The square root of 2155523065 is about 46427.6110197370. The cubic root of 2155523065 is about 1291.7671162857.

Adding to 2155523065 its reverse (5603255512), we get a palindrome (7758778577).

The spelling of 2155523065 in words is "two billion, one hundred fifty-five million, five hundred twenty-three thousand, sixty-five".