161661612344 has 16 divisors (see below), whose sum is σ = 303169918920. Its totient is φ = 80816300640.

The previous prime is 161661612341. The next prime is 161661612373. The reversal of 161661612344 is 443216166161.

It is a happy number.

It is a super-2 number, since 2×161661612344² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161661612341) 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 3 ways as a sum of consecutive naturals, for example, 1765754 + ... + 1855049.

Almost surely, 2^161661612344 is an apocalyptic number.

It is an amenable number.

161661612344 is a deficient number, since it is larger than the sum of its proper divisors (141508306576).

161661612344 is a wasteful number, since it uses less digits than its factorization.

161661612344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626390 (or 3626386 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The spelling of 161661612344 in words is "one hundred sixty-one billion, six hundred sixty-one million, six hundred twelve thousand, three hundred forty-four".