7971996282643 has 4 divisors (see below), whose sum is σ = 8166435216408. Its totient is φ = 7777557348880.

The previous prime is 7971996282619. The next prime is 7971996282697. The reversal of 7971996282643 is 3462826991797.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7971996282643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7971996282043) 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, 97219466821 + ... + 97219466902.

It is an arithmetic number, because the mean of its divisors is an integer number (2041608804102).

Almost surely, 2^{7971996282643} is an apocalyptic number.

7971996282643 is a deficient number, since it is larger than the sum of its proper divisors (194438933765).

7971996282643 is a wasteful number, since it uses less digits than its factorization.

7971996282643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194438933764.

The product of its digits is 493807104, while the sum is 73.

The spelling of 7971996282643 in words is "seven trillion, nine hundred seventy-one billion, nine hundred ninety-six million, two hundred eighty-two thousand, six hundred forty-three".