161777710656 has 63 divisors (see below), whose sum is σ = 463734268491. Its totient is φ = 53922685824.

The previous prime is 161777710643. The next prime is 161777710751. The reversal of 161777710656 is 656017777161.

The square root of 161777710656 is 402216.

It is a perfect power (a square), and thus also a powerful number.

161777710656 is a `hidden beast` number, since 1 + 617 + 7 + 7 + 7 + 10 + 6 + 5 + 6 = 666.

161777710656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9644805 + ... + 9661563.

Almost surely, 2^161777710656 is an apocalyptic number.

161777710656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161777710656 is the 402216-th square number.

It is an amenable number.

161777710656 is an abundant number, since it is smaller than the sum of its proper divisors (301956557835).

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

161777710656 is an frugal number, since it uses more digits than its factorization.

161777710656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33536 (or 16764 counting only the distinct ones).

The product of its (nonzero) digits is 2593080, while the sum is 54.

The spelling of 161777710656 in words is "one hundred sixty-one billion, seven hundred seventy-seven million, seven hundred ten thousand, six hundred fifty-six".