791371721671 has 4 divisors (see below), whose sum is σ = 791377587000. Its totient is φ = 791365856344.

The previous prime is 791371721641. The next prime is 791371721683. The reversal of 791371721671 is 176127173197.

791371721671 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 176127173197 = 91957 ⋅1915321.

It is a cyclic number.

It is not a de Polignac number, because 791371721671 - 2³⁷ = 653932768199 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 (791371721641) 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, 2725396 + ... + 3001753.

It is an arithmetic number, because the mean of its divisors is an integer number (197844396750).

Almost surely, 2^791371721671 is an apocalyptic number.

791371721671 is a deficient number, since it is larger than the sum of its proper divisors (5865329).

791371721671 is a wasteful number, since it uses less digits than its factorization.

791371721671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865328.

The product of its digits is 777924, while the sum is 52.

The spelling of 791371721671 in words is "seven hundred ninety-one billion, three hundred seventy-one million, seven hundred twenty-one thousand, six hundred seventy-one".