161372213117 has 16 divisors (see below), whose sum is σ = 178443578880. Its totient is φ = 145398422400.

The previous prime is 161372213021. The next prime is 161372213131. The reversal of 161372213117 is 711312273161.

161372213117 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 161372213117 - 2¹⁸ = 161371950973 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 (161372213617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2923109 + ... + 2977802.

It is an arithmetic number, because the mean of its divisors is an integer number (11152723680).

Almost surely, 2^161372213117 is an apocalyptic number.

It is an amenable number.

161372213117 is a deficient number, since it is larger than the sum of its proper divisors (17071365763).

161372213117 is a wasteful number, since it uses less digits than its factorization.

161372213117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5901004.

The product of its digits is 10584, while the sum is 35.

Adding to 161372213117 its reverse (711312273161), we get a palindrome (872684486278).

The spelling of 161372213117 in words is "one hundred sixty-one billion, three hundred seventy-two million, two hundred thirteen thousand, one hundred seventeen".