161331638827242 has 48 divisors (see below), whose sum is σ = 360663514852608. Its totient is φ = 48039197656320.

The previous prime is 161331638827231. The next prime is 161331638827277. The reversal of 161331638827242 is 242728836133161.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2566165023 + ... + 2566227890.

It is an arithmetic number, because the mean of its divisors is an integer number (7513823226096).

Almost surely, 2^{161331638827242} is an apocalyptic number.

161331638827242 is an abundant number, since it is smaller than the sum of its proper divisors (199331876025366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161331638827242 is a wasteful number, since it uses less digits than its factorization.

161331638827242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5132392975 (or 5132392962 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 57.

The spelling of 161331638827242 in words is "one hundred sixty-one trillion, three hundred thirty-one billion, six hundred thirty-eight million, eight hundred twenty-seven thousand, two hundred forty-two".