161244565544 has 16 divisors (see below), whose sum is σ = 302358640320. Its totient is φ = 80615594800.

The previous prime is 161244565543. The next prime is 161244565553. The reversal of 161244565544 is 445565442161.

It is not an unprimeable number, because it can be changed into a prime (161244565543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 732782 + ... + 927069.

It is an arithmetic number, because the mean of its divisors is an integer number (18897415020).

Almost surely, 2^161244565544 is an apocalyptic number.

It is an amenable number.

161244565544 is a deficient number, since it is larger than the sum of its proper divisors (141114074776).

161244565544 is a wasteful number, since it uses less digits than its factorization.

161244565544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672000 (or 1671996 counting only the distinct ones).

The product of its digits is 2304000, while the sum is 47.

The spelling of 161244565544 in words is "one hundred sixty-one billion, two hundred forty-four million, five hundred sixty-five thousand, five hundred forty-four".