721663454504243 has 8 divisors (see below), whose sum is σ = 726171105947760. Its totient is φ = 717164332204320.

The previous prime is 721663454504129. The next prime is 721663454504299. The reversal of 721663454504243 is 342405454366127.

It is a happy number.

721663454504243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721663454504243 - 2¹⁸ = 721663454242099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721663454504543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2132116148 + ... + 2132454593.

It is an arithmetic number, because the mean of its divisors is an integer number (90771388243470).

Almost surely, 2^{721663454504243} is an apocalyptic number.

721663454504243 is a deficient number, since it is larger than the sum of its proper divisors (4507651443517).

721663454504243 is a wasteful number, since it uses less digits than its factorization.

721663454504243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4264571797.

The product of its (nonzero) digits is 58060800, while the sum is 56.

The spelling of 721663454504243 in words is "seven hundred twenty-one trillion, six hundred sixty-three billion, four hundred fifty-four million, five hundred four thousand, two hundred forty-three".