1161616161 has 16 divisors (see below), whose sum is σ = 1585077120. Its totient is φ = 756483840.

The previous prime is 1161616121. The next prime is 1161616177. The reversal of 1161616161 is 1616161611.

It is not a de Polignac number, because 1161616161 - 2¹⁰ = 1161615137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161616111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1800 + ... + 48233.

It is an arithmetic number, because the mean of its divisors is an integer number (99067320).

Almost surely, 2^1161616161 is an apocalyptic number.

It is an amenable number.

1161616161 is a deficient number, since it is larger than the sum of its proper divisors (423460959).

1161616161 is a wasteful number, since it uses less digits than its factorization.

1161616161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50216.

The product of its digits is 1296, while the sum is 30.

The square root of 1161616161 is about 34082.4905339971. The cubic root of 1161616161 is about 1051.2053160908.

Adding to 1161616161 its reverse (1616161611), we get a palindrome (2777777772).

The spelling of 1161616161 in words is "one billion, one hundred sixty-one million, six hundred sixteen thousand, one hundred sixty-one".