2161564635469 has 8 divisors (see below), whose sum is σ = 2162424205440. Its totient is φ = 2160705197616.

The previous prime is 2161564635467. The next prime is 2161564635509. The reversal of 2161564635469 is 9645364651612.

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 2161564635469 - 2¹ = 2161564635467 is a prime.

It is a super-2 number, since 2×2161564635469² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161564635467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43543707 + ... + 43593319.

It is an arithmetic number, because the mean of its divisors is an integer number (270303025680).

Almost surely, 2^{2161564635469} is an apocalyptic number.

It is an amenable number.

2161564635469 is a deficient number, since it is larger than the sum of its proper divisors (859569971).

2161564635469 is a wasteful number, since it uses less digits than its factorization.

2161564635469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66059.

The product of its digits is 27993600, while the sum is 58.

The spelling of 2161564635469 in words is "two trillion, one hundred sixty-one billion, five hundred sixty-four million, six hundred thirty-five thousand, four hundred sixty-nine".