1640544123222 has 96 divisors (see below), whose sum is σ = 3757706316000. Its totient is φ = 515837652480.

The previous prime is 1640544123193. The next prime is 1640544123227. The reversal of 1640544123222 is 2223214450461.

1640544123222 is a `hidden beast` number, since 1 + 6 + 405 + 4 + 4 + 1 + 23 + 222 = 666.

It is a super-2 number, since 2×1640544123222² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640544123227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 196963554 + ... + 196971882.

It is an arithmetic number, because the mean of its divisors is an integer number (39142774125).

Almost surely, 2^{1640544123222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1640544123222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878853158000).

1640544123222 is an abundant number, since it is smaller than the sum of its proper divisors (2117162192778).

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

1640544123222 is a wasteful number, since it uses less digits than its factorization.

1640544123222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10766 (or 10763 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 1640544123222 its reverse (2223214450461), we get a palindrome (3863758573683).

The spelling of 1640544123222 in words is "one trillion, six hundred forty billion, five hundred forty-four million, one hundred twenty-three thousand, two hundred twenty-two".