221611161517 has 8 divisors (see below), whose sum is σ = 234953146400. Its totient is φ = 208437000624.

The previous prime is 221611161469. The next prime is 221611161533. The reversal of 221611161517 is 715161116122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221611161517 is a prime.

It is a super-2 number, since 2×221611161517² (a number of 23 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 (221611161587) 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, 41953278 + ... + 41958559.

It is an arithmetic number, because the mean of its divisors is an integer number (29369143300).

Almost surely, 2^221611161517 is an apocalyptic number.

It is an amenable number.

221611161517 is a deficient number, since it is larger than the sum of its proper divisors (13341984883).

221611161517 is a wasteful number, since it uses less digits than its factorization.

221611161517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83911995.

The product of its digits is 5040, while the sum is 34.

Adding to 221611161517 its reverse (715161116122), we get a palindrome (936772277639).

The spelling of 221611161517 in words is "two hundred twenty-one billion, six hundred eleven million, one hundred sixty-one thousand, five hundred seventeen".