721752704525753 has 8 divisors (see below), whose sum is σ = 722807133641160. Its totient is φ = 720698378065920.

The previous prime is 721752704525729. The next prime is 721752704525759. The reversal of 721752704525753 is 357525407257127.

It can be written as a sum of positive squares in 4 ways, for example, as 8479668288169 + 713273036237584 = 2911987^2 + 26707172^2 .

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 721752704525753 - 2³⁴ = 721735524656569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (721752704525759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11586350 + ... + 39720887.

It is an arithmetic number, because the mean of its divisors is an integer number (90350891705145).

Almost surely, 2^{721752704525753} is an apocalyptic number.

It is an amenable number.

721752704525753 is a deficient number, since it is larger than the sum of its proper divisors (1054429115407).

721752704525753 is a wasteful number, since it uses less digits than its factorization.

721752704525753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51327787.

The product of its (nonzero) digits is 144060000, while the sum is 62.

The spelling of 721752704525753 in words is "seven hundred twenty-one trillion, seven hundred fifty-two billion, seven hundred four million, five hundred twenty-five thousand, seven hundred fifty-three".