1668222551424 has 128 divisors (see below), whose sum is σ = 5205904462080. Its totient is φ = 466635663360.

The previous prime is 1668222551377. The next prime is 1668222551431. The reversal of 1668222551424 is 4241552228661.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15135052 + ... + 15244875.

It is an arithmetic number, because the mean of its divisors is an integer number (40671128610).

Almost surely, 2^{1668222551424} is an apocalyptic number.

It is an amenable number.

1668222551424 is an abundant number, since it is smaller than the sum of its proper divisors (3537681910656).

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

1668222551424 is a wasteful number, since it uses less digits than its factorization.

1668222551424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30379968 (or 30379956 counting only the distinct ones).

The product of its digits is 1843200, while the sum is 48.

The spelling of 1668222551424 in words is "one trillion, six hundred sixty-eight billion, two hundred twenty-two million, five hundred fifty-one thousand, four hundred twenty-four".