161882821672 has 128 divisors (see below), whose sum is σ = 358761312000. Its totient is φ = 67511808000.

The previous prime is 161882821651. The next prime is 161882821679. The reversal of 161882821672 is 276128288161.

161882821672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (161882821679) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 230930922 + ... + 230931622.

It is an arithmetic number, because the mean of its divisors is an integer number (2802822750).

Almost surely, 2^161882821672 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161882821672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179380656000).

161882821672 is an abundant number, since it is smaller than the sum of its proper divisors (196878490328).

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

161882821672 is a wasteful number, since it uses less digits than its factorization.

161882821672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667 (or 1663 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 52.

The spelling of 161882821672 in words is "one hundred sixty-one billion, eight hundred eighty-two million, eight hundred twenty-one thousand, six hundred seventy-two".