161665555466 has 8 divisors (see below), whose sum is σ = 242604373440. Its totient is φ = 80797430988.

The previous prime is 161665555463. The next prime is 161665555507. The reversal of 161665555466 is 664555566161.

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

It is a super-2 number, since 2×161665555466² (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 in 3 ways as a sum of consecutive naturals, for example, 17667656 + ... + 17676803.

It is an arithmetic number, because the mean of its divisors is an integer number (30325546680).

Almost surely, 2^161665555466 is an apocalyptic number.

161665555466 is a deficient number, since it is larger than the sum of its proper divisors (80938817974).

161665555466 is a wasteful number, since it uses less digits than its factorization.

161665555466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35346748.

The product of its digits is 19440000, while the sum is 56.

The spelling of 161665555466 in words is "one hundred sixty-one billion, six hundred sixty-five million, five hundred fifty-five thousand, four hundred sixty-six".