721618573463 has 4 divisors (see below), whose sum is σ = 721626979248. Its totient is φ = 721610167680.

The previous prime is 721618573457. The next prime is 721618573591. The reversal of 721618573463 is 364375816127.

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

It is a cyclic number.

It is not a de Polignac number, because 721618573463 - 2⁴ = 721618573447 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 (721618579463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072778 + ... + 4246263.

It is an arithmetic number, because the mean of its divisors is an integer number (180406744812).

Almost surely, 2^721618573463 is an apocalyptic number.

721618573463 is a deficient number, since it is larger than the sum of its proper divisors (8405785).

721618573463 is an equidigital number, since it uses as much as digits as its factorization.

721618573463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8405784.

The product of its digits is 5080320, while the sum is 53.

The spelling of 721618573463 in words is "seven hundred twenty-one billion, six hundred eighteen million, five hundred seventy-three thousand, four hundred sixty-three".