161768257688 has 16 divisors (see below), whose sum is σ = 321157570680. Its totient is φ = 76126238848.

The previous prime is 161768257667. The next prime is 161768257723. The reversal of 161768257688 is 886752867161.

It is a super-2 number, since 2×161768257688² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594736106 + ... + 594736377.

Almost surely, 2^161768257688 is an apocalyptic number.

It is an amenable number.

161768257688 is a deficient number, since it is larger than the sum of its proper divisors (159389312992).

161768257688 is a wasteful number, since it uses less digits than its factorization.

161768257688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189472506 (or 1189472502 counting only the distinct ones).

The product of its digits is 54190080, while the sum is 65.

The spelling of 161768257688 in words is "one hundred sixty-one billion, seven hundred sixty-eight million, two hundred fifty-seven thousand, six hundred eighty-eight".