161543322515 has 8 divisors (see below), whose sum is σ = 193949265408. Its totient is φ = 129169805760.

The previous prime is 161543322509. The next prime is 161543322569. The reversal of 161543322515 is 515223345161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-161543322515 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8095571 + ... + 8115500.

It is an arithmetic number, because the mean of its divisors is an integer number (24243658176).

Almost surely, 2^161543322515 is an apocalyptic number.

161543322515 is a deficient number, since it is larger than the sum of its proper divisors (32405942893).

161543322515 is a wasteful number, since it uses less digits than its factorization.

161543322515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16213069.

The product of its digits is 108000, while the sum is 38.

Adding to 161543322515 its reverse (515223345161), we get a palindrome (676766667676).

The spelling of 161543322515 in words is "one hundred sixty-one billion, five hundred forty-three million, three hundred twenty-two thousand, five hundred fifteen".