161587223448 has 32 divisors (see below), whose sum is σ = 461677781760. Its totient is φ = 46167778080.

The previous prime is 161587223423. The next prime is 161587223453. The reversal of 161587223448 is 844322785161.

It is a super-2 number, since 2×161587223448² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161587223448.

It is a congruent number.

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, 480914188 + ... + 480914523.

It is an arithmetic number, because the mean of its divisors is an integer number (14427430680).

Almost surely, 2^161587223448 is an apocalyptic number.

It is an amenable number.

161587223448 is an abundant number, since it is smaller than the sum of its proper divisors (300090558312).

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

161587223448 is a wasteful number, since it uses less digits than its factorization.

161587223448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961828727 (or 961828723 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 51.

The spelling of 161587223448 in words is "one hundred sixty-one billion, five hundred eighty-seven million, two hundred twenty-three thousand, four hundred forty-eight".