161665555468 has 6 divisors (see below), whose sum is σ = 282914722076. Its totient is φ = 80832777732.

The previous prime is 161665555463. The next prime is 161665555507. The reversal of 161665555468 is 864555566161.

It is a happy number.

It is a super-2 number, since 2×161665555468² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161665555463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20208194430 + ... + 20208194437.

Almost surely, 2^161665555468 is an apocalyptic number.

It is an amenable number.

161665555468 is a deficient number, since it is larger than the sum of its proper divisors (121249166608).

161665555468 is a wasteful number, since it uses less digits than its factorization.

161665555468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40416388871 (or 40416388869 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 58.

The spelling of 161665555468 in words is "one hundred sixty-one billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred sixty-eight".