163221764 has 6 divisors (see below), whose sum is σ = 285638094. Its totient is φ = 81610880.

The previous prime is 163221749. The next prime is 163221781. The reversal of 163221764 is 467122361.

It can be written as a sum of positive squares in only one way, i.e., 159769600 + 3452164 = 12640^2 + 1858^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 163221764.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20402717 + ... + 20402724.

It is an arithmetic number, because the mean of its divisors is an integer number (47606349).

Almost surely, 2^163221764 is an apocalyptic number.

It is an amenable number.

163221764 is a deficient number, since it is larger than the sum of its proper divisors (122416330).

163221764 is a wasteful number, since it uses less digits than its factorization.

163221764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40805445 (or 40805443 counting only the distinct ones).

The product of its digits is 12096, while the sum is 32.

The square root of 163221764 is about 12775.8273313316. The cubic root of 163221764 is about 546.5031745542.

The spelling of 163221764 in words is "one hundred sixty-three million, two hundred twenty-one thousand, seven hundred sixty-four".