161982209628 has 18 divisors (see below), whose sum is σ = 409455029984. Its totient is φ = 53994069864.

The previous prime is 161982209551. The next prime is 161982209629. The reversal of 161982209628 is 826902289161.

It is a happy number.

161982209628 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 8 + 2 + 2 + 0 + 9 + 628 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161982209629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2249752876 + ... + 2249752947.

Almost surely, 2^161982209628 is an apocalyptic number.

161982209628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161982209628 is an abundant number, since it is smaller than the sum of its proper divisors (247472820356).

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

161982209628 is a wasteful number, since it uses less digits than its factorization.

161982209628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499505833 (or 4499505828 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 161982209628 in words is "one hundred sixty-one billion, nine hundred eighty-two million, two hundred nine thousand, six hundred twenty-eight".