1968528278447 has 4 divisors (see below), whose sum is σ = 1970011722336. Its totient is φ = 1967044834560.

The previous prime is 1968528278429. The next prime is 1968528278449. The reversal of 1968528278447 is 7448728258691.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1968528278447 - 2⁸ = 1968528278191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968528278449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741719954 + ... + 741722607.

It is an arithmetic number, because the mean of its divisors is an integer number (492502930584).

Almost surely, 2^{1968528278447} is an apocalyptic number.

1968528278447 is a deficient number, since it is larger than the sum of its proper divisors (1483443889).

1968528278447 is a wasteful number, since it uses less digits than its factorization.

1968528278447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1483443888.

The product of its digits is 433520640, while the sum is 71.

The spelling of 1968528278447 in words is "one trillion, nine hundred sixty-eight billion, five hundred twenty-eight million, two hundred seventy-eight thousand, four hundred forty-seven".