5257353805721 has 4 divisors (see below), whose sum is σ = 5263348508772. Its totient is φ = 5251359102672.

The previous prime is 5257353805651. The next prime is 5257353805741. The reversal of 5257353805721 is 1275083537525.

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 2576782615696 + 2680571190025 = 1605236^2 + 1637245^2 .

It is a cyclic number.

It is not a de Polignac number, because 5257353805721 - 2¹⁰ = 5257353804697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5257353805741) 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, 2997350210 + ... + 2997351963.

It is an arithmetic number, because the mean of its divisors is an integer number (1315837127193).

Almost surely, 2^{5257353805721} is an apocalyptic number.

It is an amenable number.

5257353805721 is a deficient number, since it is larger than the sum of its proper divisors (5994703051).

5257353805721 is an equidigital number, since it uses as much as digits as its factorization.

5257353805721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5994703050.

The product of its (nonzero) digits is 8820000, while the sum is 53.

The spelling of 5257353805721 in words is "five trillion, two hundred fifty-seven billion, three hundred fifty-three million, eight hundred five thousand, seven hundred twenty-one".