2165864324657 has 8 divisors (see below), whose sum is σ = 2362775471712. Its totient is φ = 1968955576000.

The previous prime is 2165864324623. The next prime is 2165864324681. The reversal of 2165864324657 is 7564234685612.

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 2165864324657 - 2¹² = 2165864320561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2165864324596 and 2165864324605.

It is not an unprimeable number, because it can be changed into a prime (2162864324657) 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, 1658282 + ... + 2661132.

It is an arithmetic number, because the mean of its divisors is an integer number (295346933964).

Almost surely, 2^{2165864324657} is an apocalyptic number.

It is an amenable number.

2165864324657 is a deficient number, since it is larger than the sum of its proper divisors (196911147055).

2165864324657 is a wasteful number, since it uses less digits than its factorization.

2165864324657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199199.

The product of its digits is 58060800, while the sum is 59.

The spelling of 2165864324657 in words is "two trillion, one hundred sixty-five billion, eight hundred sixty-four million, three hundred twenty-four thousand, six hundred fifty-seven".