161611611 has 8 divisors (see below), whose sum is σ = 246265344. Its totient is φ = 92349480.

The previous prime is 161611607. The next prime is 161611633. The reversal of 161611611 is 116116161.

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

It is not a de Polignac number, because 161611611 - 2² = 161611607 is a prime.

It is a super-2 number, since 2×161611611² = 52236625620030642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161611601) 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, 3847875 + ... + 3847916.

It is an arithmetic number, because the mean of its divisors is an integer number (30783168).

Almost surely, 2^161611611 is an apocalyptic number.

161611611 is a deficient number, since it is larger than the sum of its proper divisors (84653733).

161611611 is an equidigital number, since it uses as much as digits as its factorization.

161611611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7695801.

The product of its digits is 216, while the sum is 24.

The square root of 161611611 is about 12712.6555447711. The cubic root of 161611611 is about 544.7001813032.

Adding to 161611611 its reverse (116116161), we get a palindrome (277727772).

The spelling of 161611611 in words is "one hundred sixty-one million, six hundred eleven thousand, six hundred eleven".