2171505065 has 8 divisors (see below), whose sum is σ = 2695661640. Its totient is φ = 1677300352.

The previous prime is 2171505053. The next prime is 2171505097. The reversal of 2171505065 is 5605051712.

It can be written as a sum of positive squares in 4 ways, for example, as 484924441 + 1686580624 = 22021^2 + 41068^2 .

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 2171505065 - 2⁶ = 2171505001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7487804 + ... + 7488093.

It is an arithmetic number, because the mean of its divisors is an integer number (336957705).

Almost surely, 2^2171505065 is an apocalyptic number.

It is an amenable number.

2171505065 is a deficient number, since it is larger than the sum of its proper divisors (524156575).

2171505065 is a wasteful number, since it uses less digits than its factorization.

2171505065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14975931.

The product of its (nonzero) digits is 10500, while the sum is 32.

The square root of 2171505065 is about 46599.4105649417. The cubic root of 2171505065 is about 1294.9518355396.

Adding to 2171505065 its reverse (5605051712), we get a palindrome (7776556777).

The spelling of 2171505065 in words is "two billion, one hundred seventy-one million, five hundred five thousand, sixty-five".