1968257478916 has 9 divisors (see below), whose sum is σ = 3444455498421. Its totient is φ = 984127336512.

The previous prime is 1968257478877. The next prime is 1968257478931. The reversal of 1968257478916 is 6198747528691.

The square root of 1968257478916 is 1402946.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 548118122500 + 1420139356416 = 740350^2 + 1191696^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2455156 + ... + 3156628.

Almost surely, 2^{1968257478916} is an apocalyptic number.

1968257478916 is the 1402946-th square number.

It is an amenable number.

1968257478916 is a deficient number, since it is larger than the sum of its proper divisors (1476198019505).

1968257478916 is an frugal number, since it uses more digits than its factorization.

1968257478916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402950 (or 701475 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 73.

The spelling of 1968257478916 in words is "one trillion, nine hundred sixty-eight billion, two hundred fifty-seven million, four hundred seventy-eight thousand, nine hundred sixteen".