6721623250453 has 4 divisors (see below), whose sum is σ = 6731792121388. Its totient is φ = 6711454379520.

The previous prime is 6721623250423. The next prime is 6721623250457. The reversal of 6721623250453 is 3540523261276.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3692150721009 + 3029472529444 = 1921497^2 + 1740538^2 .

It is a cyclic number.

It is not a de Polignac number, because 6721623250453 - 2²⁵ = 6721589696021 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 (6721623250457) 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, 5084434476 + ... + 5084435797.

It is an arithmetic number, because the mean of its divisors is an integer number (1682948030347).

Almost surely, 2^{6721623250453} is an apocalyptic number.

It is an amenable number.

6721623250453 is a deficient number, since it is larger than the sum of its proper divisors (10168870935).

6721623250453 is a wasteful number, since it uses less digits than its factorization.

6721623250453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10168870934.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 6721623250453 in words is "six trillion, seven hundred twenty-one billion, six hundred twenty-three million, two hundred fifty thousand, four hundred fifty-three".