161587982796 has 48 divisors (see below), whose sum is σ = 377857041408. Its totient is φ = 53745840000.

The previous prime is 161587982729. The next prime is 161587982797. The reversal of 161587982796 is 697289785161.

It is a super-2 number, since 2×161587982796² (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 161587982796.

It is not an unprimeable number, because it can be changed into a prime (161587982797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18393421 + ... + 18402203.

It is an arithmetic number, because the mean of its divisors is an integer number (7872021696).

Almost surely, 2^161587982796 is an apocalyptic number.

It is an amenable number.

161587982796 is an abundant number, since it is smaller than the sum of its proper divisors (216269058612).

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

161587982796 is a wasteful number, since it uses less digits than its factorization.

161587982796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11942 (or 11940 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 69.

The spelling of 161587982796 in words is "one hundred sixty-one billion, five hundred eighty-seven million, nine hundred eighty-two thousand, seven hundred ninety-six".