161220563611 has 8 divisors (see below), whose sum is σ = 161793842000. Its totient is φ = 160647922080.

The previous prime is 161220563549. The next prime is 161220563617. The reversal of 161220563611 is 116365022161.

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 161220563611 - 2²¹ = 161218466459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161220563617) 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, 350881 + ... + 667501.

It is an arithmetic number, because the mean of its divisors is an integer number (20224230250).

Almost surely, 2^161220563611 is an apocalyptic number.

161220563611 is a deficient number, since it is larger than the sum of its proper divisors (573278389).

161220563611 is a wasteful number, since it uses less digits than its factorization.

161220563611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318429.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 161220563611 its reverse (116365022161), we get a palindrome (277585585772).

The spelling of 161220563611 in words is "one hundred sixty-one billion, two hundred twenty million, five hundred sixty-three thousand, six hundred eleven".