6721860250791 has 48 divisors (see below), whose sum is σ = 11108237211136. Its totient is φ = 3836968584768.

The previous prime is 6721860250783. The next prime is 6721860250813. The reversal of 6721860250791 is 1970520681276.

6721860250791 is a `hidden beast` number, since 6 + 7 + 21 + 8 + 602 + 5 + 0 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 6721860250791 - 2³ = 6721860250783 is a prime.

It is a super-2 number, since 2×6721860250791² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721860250751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 429696216 + ... + 429711858.

Almost surely, 2^{6721860250791} is an apocalyptic number.

6721860250791 is a deficient number, since it is larger than the sum of its proper divisors (4386376960345).

6721860250791 is a wasteful number, since it uses less digits than its factorization.

6721860250791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22492 (or 22489 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 6721860250791 in words is "six trillion, seven hundred twenty-one billion, eight hundred sixty million, two hundred fifty thousand, seven hundred ninety-one".