1968219543172 has 6 divisors (see below), whose sum is σ = 3444384200558. Its totient is φ = 984109771584.

The previous prime is 1968219543163. The next prime is 1968219543197. The reversal of 1968219543172 is 2713459128691.

It can be written as a sum of positive squares in only one way, i.e., 1968201361476 + 18181696 = 1402926^2 + 4264^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246027442893 + ... + 246027442900.

Almost surely, 2^{1968219543172} is an apocalyptic number.

It is an amenable number.

1968219543172 is a deficient number, since it is larger than the sum of its proper divisors (1476164657386).

1968219543172 is a wasteful number, since it uses less digits than its factorization.

1968219543172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492054885797 (or 492054885795 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 58.

The spelling of 1968219543172 in words is "one trillion, nine hundred sixty-eight billion, two hundred nineteen million, five hundred forty-three thousand, one hundred seventy-two".