161106551111 has 8 divisors (see below), whose sum is σ = 183394018944. Its totient is φ = 140092652920.

The previous prime is 161106551101. The next prime is 161106551113. The reversal of 161106551111 is 111155601161.

It is a happy number.

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

It is not a de Polignac number, because 161106551111 - 2²⁶ = 161039442247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161106551113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318392141 + ... + 318392646.

It is an arithmetic number, because the mean of its divisors is an integer number (22924252368).

Almost surely, 2^161106551111 is an apocalyptic number.

161106551111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161106551111 is a deficient number, since it is larger than the sum of its proper divisors (22287467833).

161106551111 is a wasteful number, since it uses less digits than its factorization.

161106551111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636784821.

The product of its (nonzero) digits is 900, while the sum is 29.

It can be divided in two parts, 161106 and 551111, that added together give a palindrome (712217).

The spelling of 161106551111 in words is "one hundred sixty-one billion, one hundred six million, five hundred fifty-one thousand, one hundred eleven".