161986477824 has 108 divisors (see below), whose sum is σ = 491628501000. Its totient is φ = 51153610752.

The previous prime is 161986477819. The next prime is 161986477837. The reversal of 161986477824 is 428774689161.

161986477824 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 86 + 477 + 82 + 4 = 666.

161986477824 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1806399 + ... + 1893950.

It is an arithmetic number, because the mean of its divisors is an integer number (4552115750).

Almost surely, 2^161986477824 is an apocalyptic number.

It is an amenable number.

161986477824 is an abundant number, since it is smaller than the sum of its proper divisors (329642023176).

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

161986477824 is a wasteful number, since it uses less digits than its factorization.

161986477824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700390 (or 3700373 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 161986477824 in words is "one hundred sixty-one billion, nine hundred eighty-six million, four hundred seventy-seven thousand, eight hundred twenty-four".