161916617442 has 16 divisors (see below), whose sum is σ = 323917110720. Its totient is φ = 53958226512.

The previous prime is 161916617363. The next prime is 161916617449. The reversal of 161916617442 is 244716619161.

It is a junction number, because it is equal to n+sod(n) for n = 161916617391 and 161916617400.

It is not an unprimeable number, because it can be changed into a prime (161916617449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3469717 + ... + 3516072.

It is an arithmetic number, because the mean of its divisors is an integer number (20244819420).

Almost surely, 2^161916617442 is an apocalyptic number.

161916617442 is an abundant number, since it is smaller than the sum of its proper divisors (162000493278).

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

161916617442 is a wasteful number, since it uses less digits than its factorization.

161916617442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6989657.

The product of its digits is 435456, while the sum is 48.

The spelling of 161916617442 in words is "one hundred sixty-one billion, nine hundred sixteen million, six hundred seventeen thousand, four hundred forty-two".