161717166661200 has 120 divisors (see below), whose sum is σ = 535897231706400. Its totient is φ = 41637523361280.

The previous prime is 161717166661121. The next prime is 161717166661201. The reversal of 161717166661200 is 2166661717161.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161717166661201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2323487710 + ... + 2323557309.

It is an arithmetic number, because the mean of its divisors is an integer number (4465810264220).

Almost surely, 2^{161717166661200} is an apocalyptic number.

161717166661200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161717166661200 is an abundant number, since it is smaller than the sum of its proper divisors (374180065045200).

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

161717166661200 is a wasteful number, since it uses less digits than its factorization.

161717166661200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4647045069 (or 4647045058 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 161717166661200 in words is "one hundred sixty-one trillion, seven hundred seventeen billion, one hundred sixty-six million, six hundred sixty-one thousand, two hundred".