7721847048871 has 4 divisors (see below), whose sum is σ = 7740188728744. Its totient is φ = 7703505369000.

The previous prime is 7721847048857. The next prime is 7721847048991. The reversal of 7721847048871 is 1788407481277.

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 7721847048871 - 2⁹ = 7721847048359 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 (7721847048841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9170839305 + ... + 9170840146.

It is an arithmetic number, because the mean of its divisors is an integer number (1935047182186).

Almost surely, 2^{7721847048871} is an apocalyptic number.

7721847048871 is a deficient number, since it is larger than the sum of its proper divisors (18341679873).

7721847048871 is a wasteful number, since it uses less digits than its factorization.

7721847048871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18341679872.

The product of its (nonzero) digits is 39337984, while the sum is 64.

The spelling of 7721847048871 in words is "seven trillion, seven hundred twenty-one billion, eight hundred forty-seven million, forty-eight thousand, eight hundred seventy-one".