161942581867798 has 8 divisors (see below), whose sum is σ = 242926041066408. Its totient is φ = 80967234845664.

The previous prime is 161942581867763. The next prime is 161942581867819. The reversal of 161942581867798 is 897768185249161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027994211 + ... + 2028074062.

It is an arithmetic number, because the mean of its divisors is an integer number (30365755133301).

Almost surely, 2^{161942581867798} is an apocalyptic number.

161942581867798 is a deficient number, since it is larger than the sum of its proper divisors (80983459198610).

161942581867798 is a wasteful number, since it uses less digits than its factorization.

161942581867798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4056088238.

The product of its digits is 2926264320, while the sum is 82.

The spelling of 161942581867798 in words is "one hundred sixty-one trillion, nine hundred forty-two billion, five hundred eighty-one million, eight hundred sixty-seven thousand, seven hundred ninety-eight".