161243843602 has 16 divisors (see below), whose sum is σ = 252785415960. Its totient is φ = 77039359488.

The previous prime is 161243843533. The next prime is 161243843611. The reversal of 161243843602 is 206348342161.

It can be written as a sum of positive squares in 4 ways, for example, as 111496555921 + 49747287681 = 333911^2 + 223041^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14324613 + ... + 14335864.

Almost surely, 2^161243843602 is an apocalyptic number.

161243843602 is a deficient number, since it is larger than the sum of its proper divisors (91541572358).

161243843602 is a wasteful number, since it uses less digits than its factorization.

161243843602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28660605.

The product of its (nonzero) digits is 165888, while the sum is 40.

The spelling of 161243843602 in words is "one hundred sixty-one billion, two hundred forty-three million, eight hundred forty-three thousand, six hundred two".