161584405081 has 8 divisors (see below), whose sum is σ = 176343848928. Its totient is φ = 146836620000.

The previous prime is 161584405079. The next prime is 161584405097. The reversal of 161584405081 is 180504485161.

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 161584405081 - 2¹ = 161584405079 is a prime.

It is a super-2 number, since 2×161584405081² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161584405681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2885695 + ... + 2941156.

It is an arithmetic number, because the mean of its divisors is an integer number (22042981116).

Almost surely, 2^161584405081 is an apocalyptic number.

161584405081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161584405081 is a deficient number, since it is larger than the sum of its proper divisors (14759443847).

161584405081 is a wasteful number, since it uses less digits than its factorization.

161584405081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5829383.

The product of its (nonzero) digits is 153600, while the sum is 43.

It can be divided in two parts, 161584 and 405081, that added together give a palindrome (566665).

The spelling of 161584405081 in words is "one hundred sixty-one billion, five hundred eighty-four million, four hundred five thousand, eighty-one".