53553721717 has 2 divisors, whose sum is σ = 53553721718. Its totient is φ = 53553721716.

The previous prime is 53553721681. The next prime is 53553721723. The reversal of 53553721717 is 71712735535.

53553721717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45389876401 + 8163845316 = 213049^2 + 90354^2 .

It is a cyclic number.

It is not a de Polignac number, because 53553721717 - 2¹¹ = 53553719669 is a prime.

It is a super-2 number, since 2×53553721717² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53553721787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26776860858 + 26776860859.

It is an arithmetic number, because the mean of its divisors is an integer number (26776860859).

Almost surely, 2^53553721717 is an apocalyptic number.

It is an amenable number.

53553721717 is a deficient number, since it is larger than the sum of its proper divisors (1).

53553721717 is an equidigital number, since it uses as much as digits as its factorization.

53553721717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 771750, while the sum is 46.

The spelling of 53553721717 in words is "fifty-three billion, five hundred fifty-three million, seven hundred twenty-one thousand, seven hundred seventeen".