161655768208 has 40 divisors (see below), whose sum is σ = 341961345216. Its totient is φ = 73419715200.

The previous prime is 161655768199. The next prime is 161655768227. The reversal of 161655768208 is 802867556161.

It is a super-2 number, since 2×161655768208² (a number of 23 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 160263 + ... + 590758.

Almost surely, 2^161655768208 is an apocalyptic number.

It is an amenable number.

161655768208 is an abundant number, since it is smaller than the sum of its proper divisors (180305577008).

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

161655768208 is a wasteful number, since it uses less digits than its factorization.

161655768208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752263 (or 752257 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 161655768208 in words is "one hundred sixty-one billion, six hundred fifty-five million, seven hundred sixty-eight thousand, two hundred eight".