161687626816 has 21 divisors (see below), whose sum is σ = 320855267991. Its totient is φ = 80842204992.

The previous prime is 161687626811. The next prime is 161687626819. The reversal of 161687626816 is 618626786161.

The square root of 161687626816 is 402104.

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

It is a super-2 number, since 2×161687626816² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161687626811) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3191701 + ... + 3241963.

Almost surely, 2^161687626816 is an apocalyptic number.

161687626816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161687626816 is the 402104-th square number.

It is an amenable number.

161687626816 is a deficient number, since it is larger than the sum of its proper divisors (159167641175).

161687626816 is an frugal number, since it uses more digits than its factorization.

161687626816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100538 (or 50265 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 58.

The spelling of 161687626816 in words is "one hundred sixty-one billion, six hundred eighty-seven million, six hundred twenty-six thousand, eight hundred sixteen".