161704555 has 8 divisors (see below), whose sum is σ = 194126400. Its totient is φ = 129309696.

The previous prime is 161704549. The next prime is 161704579. The reversal of 161704555 is 555407161.

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

It is a cyclic number.

It is not a de Polignac number, because 161704555 - 2⁵ = 161704523 is a prime.

It is a super-2 number, since 2×161704555² = 52296726215496050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161704555.

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, 10411 + ... + 20779.

It is an arithmetic number, because the mean of its divisors is an integer number (24265800).

Almost surely, 2^161704555 is an apocalyptic number.

161704555 is a deficient number, since it is larger than the sum of its proper divisors (32421845).

161704555 is a wasteful number, since it uses less digits than its factorization.

161704555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13493.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 161704555 is about 12716.3105891607. The cubic root of 161704555 is about 544.8045816228.

The spelling of 161704555 in words is "one hundred sixty-one million, seven hundred four thousand, five hundred fifty-five".