6726891553 has 4 divisors (see below), whose sum is σ = 6740704960. Its totient is φ = 6713078148.

The previous prime is 6726891541. The next prime is 6726891583. The reversal of 6726891553 is 3551986276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6726891553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6726891553.

It is not an unprimeable number, because it can be changed into a prime (6726891503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6905973 + ... + 6906946.

It is an arithmetic number, because the mean of its divisors is an integer number (1685176240).

Almost surely, 2^6726891553 is an apocalyptic number.

It is an amenable number.

6726891553 is a deficient number, since it is larger than the sum of its proper divisors (13813407).

6726891553 is a wasteful number, since it uses less digits than its factorization.

6726891553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13813406.

The product of its digits is 2721600, while the sum is 52.

The square root of 6726891553 is about 82017.6295256087. The cubic root of 6726891553 is about 1887.7224558241.

The spelling of 6726891553 in words is "six billion, seven hundred twenty-six million, eight hundred ninety-one thousand, five hundred fifty-three".