161243645834 has 32 divisors (see below), whose sum is σ = 244264066560. Its totient is φ = 79827576192.

The previous prime is 161243645789. The next prime is 161243645869. The reversal of 161243645834 is 438546342161.

It is a super-4 number, since 4×161243645834⁴ (a number of 46 digits) contains 4444 as substring.

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, 72860912 + ... + 72863124.

It is an arithmetic number, because the mean of its divisors is an integer number (7633252080).

Almost surely, 2^161243645834 is an apocalyptic number.

161243645834 is a deficient number, since it is larger than the sum of its proper divisors (83020420726).

161243645834 is a wasteful number, since it uses less digits than its factorization.

161243645834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3254.

The product of its digits is 1658880, while the sum is 47.

Adding to 161243645834 its reverse (438546342161), we get a palindrome (599789987995).

The spelling of 161243645834 in words is "one hundred sixty-one billion, two hundred forty-three million, six hundred forty-five thousand, eight hundred thirty-four".