161606109983616 has 96 divisors (see below), whose sum is σ = 465993321409200. Its totient is φ = 53758089787392.

The previous prime is 161606109983611. The next prime is 161606109983663. The reversal of 161606109983616 is 616389901606161.

161606109983616 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 0 + 6 + 1 + 0 + 9 + 9 + 8 + 3 + 616 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161606109983616² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606109983611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143466781 + ... + 144588828.

Almost surely, 2^{161606109983616} is an apocalyptic number.

161606109983616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161606109983616 is an abundant number, since it is smaller than the sum of its proper divisors (304387211425584).

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

161606109983616 is a wasteful number, since it uses less digits than its factorization.

161606109983616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288056116 (or 288056101 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 161606109983616 in words is "one hundred sixty-one trillion, six hundred six billion, one hundred nine million, nine hundred eighty-three thousand, six hundred sixteen".