161605501111106 has 8 divisors (see below), whose sum is σ = 261055040256444. Its totient is φ = 74587154358960.

The previous prime is 161605501111099. The next prime is 161605501111133. The reversal of 161605501111106 is 601111105506161.

It can be written as a sum of positive squares in 2 ways, for example, as 129965494858081 + 31640006253025 = 11400241^2 + 5624945^2 .

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

It is a super-2 number, since 2×161605501111106² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3107798098265 + ... + 3107798098316.

Almost surely, 2^{161605501111106} is an apocalyptic number.

161605501111106 is a deficient number, since it is larger than the sum of its proper divisors (99449539145338).

161605501111106 is a wasteful number, since it uses less digits than its factorization.

161605501111106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6215596196596.

The product of its (nonzero) digits is 5400, while the sum is 35.

Adding to 161605501111106 its reverse (601111105506161), we get a palindrome (762716606617267).

The spelling of 161605501111106 in words is "one hundred sixty-one trillion, six hundred five billion, five hundred one million, one hundred eleven thousand, one hundred six".