161560511601 has 8 divisors (see below), whose sum is σ = 215437168320. Its totient is φ = 107695431312.

The previous prime is 161560511591. The next prime is 161560511659. The reversal of 161560511601 is 106115065161.

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

It is not a de Polignac number, because 161560511601 - 2⁵ = 161560511569 is a prime.

It is a super-2 number, since 2×161560511601² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161560511681) 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, 2861490 + ... + 2917403.

It is an arithmetic number, because the mean of its divisors is an integer number (26929646040).

Almost surely, 2^161560511601 is an apocalyptic number.

It is an amenable number.

161560511601 is a deficient number, since it is larger than the sum of its proper divisors (53876656719).

161560511601 is an equidigital number, since it uses as much as digits as its factorization.

161560511601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5788215.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 161560511601 its reverse (106115065161), we get a palindrome (267675576762).

The spelling of 161560511601 in words is "one hundred sixty-one billion, five hundred sixty million, five hundred eleven thousand, six hundred one".