53121666605 has 24 divisors (see below), whose sum is σ = 75962146680. Its totient is φ = 35537832960.

The previous prime is 53121666601. The next prime is 53121666607. The reversal of 53121666605 is 50666612135.

53121666605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 28751044 + 53092915561 = 5362^2 + 230419^2 .

It is not a de Polignac number, because 53121666605 - 2² = 53121666601 is a prime.

It is a super-2 number, since 2×53121666605² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53121666601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2634140 + ... + 2654229.

It is an arithmetic number, because the mean of its divisors is an integer number (3165089445).

Almost surely, 2^53121666605 is an apocalyptic number.

It is an amenable number.

53121666605 is a deficient number, since it is larger than the sum of its proper divisors (22840480075).

53121666605 is a wasteful number, since it uses less digits than its factorization.

53121666605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5288429 (or 5288422 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 53121666605 in words is "fifty-three billion, one hundred twenty-one million, six hundred sixty-six thousand, six hundred five".