161065553 has 8 divisors (see below), whose sum is σ = 181376256. Its totient is φ = 141699600.

The previous prime is 161065549. The next prime is 161065561. The reversal of 161065553 is 355560161.

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 161065553 - 2² = 161065549 is a prime.

It is a super-2 number, since 2×161065553² = 51884224726391618, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161065523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235826 + ... + 236507.

It is an arithmetic number, because the mean of its divisors is an integer number (22672032).

Almost surely, 2^161065553 is an apocalyptic number.

It is an amenable number.

161065553 is a deficient number, since it is larger than the sum of its proper divisors (20310703).

161065553 is a wasteful number, since it uses less digits than its factorization.

161065553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472375.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 161065553 is about 12691.1604276362. The cubic root of 161065553 is about 544.0860061267.

The spelling of 161065553 in words is "one hundred sixty-one million, sixty-five thousand, five hundred fifty-three".