161115640018 has 16 divisors (see below), whose sum is σ = 242002927584. Its totient is φ = 80448074560.

The previous prime is 161115639989. The next prime is 161115640019. The reversal of 161115640018 is 810046511161.

It is not an unprimeable number, because it can be changed into a prime (161115640019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4519821 + ... + 4555327.

It is an arithmetic number, because the mean of its divisors is an integer number (15125182974).

Almost surely, 2^161115640018 is an apocalyptic number.

161115640018 is a deficient number, since it is larger than the sum of its proper divisors (80887287566).

161115640018 is a wasteful number, since it uses less digits than its factorization.

161115640018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38537.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 161115640018 in words is "one hundred sixty-one billion, one hundred fifteen million, six hundred forty thousand, eighteen".