1968981465616 has 45 divisors (see below), whose sum is σ = 4193370428079. Its totient is φ = 894963511200.

The previous prime is 1968981465611. The next prime is 1968981465643. The reversal of 1968981465616 is 6165641898691.

It is a happy number.

The square root of 1968981465616 is 1403204.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968981465611) by changing a digit.

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 in 8 ways as a sum of consecutive naturals, for example, 61725031 + ... + 61756921.

Almost surely, 2^{1968981465616} is an apocalyptic number.

1968981465616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

1968981465616 is the 1403204-th square number.

It is an amenable number.

1968981465616 is an abundant number, since it is smaller than the sum of its proper divisors (2224388962463).

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

1968981465616 is an frugal number, since it uses more digits than its factorization.

1968981465616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63812 (or 31904 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 70.

The spelling of 1968981465616 in words is "one trillion, nine hundred sixty-eight billion, nine hundred eighty-one million, four hundred sixty-five thousand, six hundred sixteen".