161660156166 has 48 divisors (see below), whose sum is σ = 365564908800. Its totient is φ = 51533610480.

The previous prime is 161660156123. The next prime is 161660156221. The reversal of 161660156166 is 661651066161.

161660156166 is a `hidden beast` number, since 1 + 6 + 16 + 6 + 0 + 15 + 616 + 6 = 666.

It is a super-2 number, since 2×161660156166² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 2212485 + ... + 2284383.

It is an arithmetic number, because the mean of its divisors is an integer number (7615935600).

Almost surely, 2^161660156166 is an apocalyptic number.

161660156166 is an abundant number, since it is smaller than the sum of its proper divisors (203904752634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161660156166 is a wasteful number, since it uses less digits than its factorization.

161660156166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77361 (or 77358 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 161660156166 in words is "one hundred sixty-one billion, six hundred sixty million, one hundred fifty-six thousand, one hundred sixty-six".