6721194855823 has 6 divisors (see below), whose sum is σ = 7681373388584. Its totient is φ = 5761018282836.

The previous prime is 6721194855799. The next prime is 6721194855839. The reversal of 6721194855823 is 3285584911276.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-6721194855823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721194850823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6369240 + ... + 7349122.

Almost surely, 2^{6721194855823} is an apocalyptic number.

6721194855823 is a deficient number, since it is larger than the sum of its proper divisors (960178532761).

6721194855823 is an frugal number, since it uses more digits than its factorization.

6721194855823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959773 (or 979890 counting only the distinct ones).

The product of its digits is 29030400, while the sum is 61.

The spelling of 6721194855823 in words is "six trillion, seven hundred twenty-one billion, one hundred ninety-four million, eight hundred fifty-five thousand, eight hundred twenty-three".