161543322516 has 48 divisors (see below), whose sum is σ = 380759992704. Its totient is φ = 53301720576.

The previous prime is 161543322509. The next prime is 161543322569. The reversal of 161543322516 is 615223345161.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2930440 + ... + 2985056.

It is an arithmetic number, because the mean of its divisors is an integer number (7932499848).

Almost surely, 2^161543322516 is an apocalyptic number.

It is an amenable number.

161543322516 is an abundant number, since it is smaller than the sum of its proper divisors (219216670188).

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

161543322516 is a wasteful number, since it uses less digits than its factorization.

161543322516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57120 (or 57118 counting only the distinct ones).

The product of its digits is 129600, while the sum is 39.

Adding to 161543322516 its reverse (615223345161), we get a palindrome (776766667677).

The spelling of 161543322516 in words is "one hundred sixty-one billion, five hundred forty-three million, three hundred twenty-two thousand, five hundred sixteen".