161761776808 has 8 divisors (see below), whose sum is σ = 303303331530. Its totient is φ = 80880888400.

The previous prime is 161761776797. The next prime is 161761776821. The reversal of 161761776808 is 808677167161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 129440209284 + 32321567524 = 359778^2 + 179782^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110111043 + ... + 10110111058.

Almost surely, 2^161761776808 is an apocalyptic number.

It is an amenable number.

161761776808 is a deficient number, since it is larger than the sum of its proper divisors (141541554722).

161761776808 is a wasteful number, since it uses less digits than its factorization.

161761776808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20220222107 (or 20220222103 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 58.

The spelling of 161761776808 in words is "one hundred sixty-one billion, seven hundred sixty-one million, seven hundred seventy-six thousand, eight hundred eight".