161722015611106 has 4 divisors (see below), whose sum is σ = 242583023416662. Its totient is φ = 80861007805552.

The previous prime is 161722015611103. The next prime is 161722015611137. The reversal of 161722015611106 is 601116510227161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103168529010481 + 58553486600625 = 10157191^2 + 7652025^2 .

It is not an unprimeable number, because it can be changed into a prime (161722015611103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40430503902775 + ... + 40430503902778.

Almost surely, 2^{161722015611106} is an apocalyptic number.

161722015611106 is a deficient number, since it is larger than the sum of its proper divisors (80861007805556).

161722015611106 is an equidigital number, since it uses as much as digits as its factorization.

161722015611106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80861007805555.

The product of its (nonzero) digits is 30240, while the sum is 40.

Adding to 161722015611106 its reverse (601116510227161), we get a palindrome (762838525838267).

The spelling of 161722015611106 in words is "one hundred sixty-one trillion, seven hundred twenty-two billion, fifteen million, six hundred eleven thousand, one hundred six".