161665106100666 has 16 divisors (see below), whose sum is σ = 369520242515904. Its totient is φ = 46190030314464.

The previous prime is 161665106100647. The next prime is 161665106100671. The reversal of 161665106100666 is 666001601566161.

It is a super-2 number, since 2×161665106100666² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924584596395 + ... + 1924584596478.

It is an arithmetic number, because the mean of its divisors is an integer number (23095015157244).

Almost surely, 2^{161665106100666} is an apocalyptic number.

161665106100666 is an abundant number, since it is smaller than the sum of its proper divisors (207855136415238).

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

161665106100666 is a wasteful number, since it uses less digits than its factorization.

161665106100666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3849169192885.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 161665106100666 in words is "one hundred sixty-one trillion, six hundred sixty-five billion, one hundred six million, one hundred thousand, six hundred sixty-six".