53121666601 has 2 divisors, whose sum is σ = 53121666602. Its totient is φ = 53121666600.

The previous prime is 53121666581. The next prime is 53121666607. The reversal of 53121666601 is 10666612135.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50609251225 + 2512415376 = 224965^2 + 50124^2 .

It is a cyclic number.

It is not a de Polignac number, because 53121666601 - 2⁵ = 53121666569 is a prime.

It is a super-2 number, since 2×53121666601² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (53121666607) 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 as a sum of consecutive naturals, namely, 26560833300 + 26560833301.

It is an arithmetic number, because the mean of its divisors is an integer number (26560833301).

Almost surely, 2^53121666601 is an apocalyptic number.

It is an amenable number.

53121666601 is a deficient number, since it is larger than the sum of its proper divisors (1).

53121666601 is an equidigital number, since it uses as much as digits as its factorization.

53121666601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 53121666601 in words is "fifty-three billion, one hundred twenty-one million, six hundred sixty-six thousand, six hundred one".