53644520421 has 48 divisors (see below), whose sum is σ = 81296233200. Its totient is φ = 34042466304.

The previous prime is 53644520401. The next prime is 53644520429. The reversal of 53644520421 is 12402544635.

53644520421 is a `hidden beast` number, since 5 + 3 + 6 + 445 + 204 + 2 + 1 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 10938231396 + 42706289025 = 104586^2 + 206655^2 .

It is not a de Polignac number, because 53644520421 - 2³⁵ = 19284782053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53644520429) 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 47 ways as a sum of consecutive naturals, for example, 6806335 + ... + 6814211.

It is an arithmetic number, because the mean of its divisors is an integer number (1693671525).

Almost surely, 2^53644520421 is an apocalyptic number.

It is an amenable number.

53644520421 is a deficient number, since it is larger than the sum of its proper divisors (27651712779).

53644520421 is a wasteful number, since it uses less digits than its factorization.

53644520421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278 (or 8275 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 36.

The spelling of 53644520421 in words is "fifty-three billion, six hundred forty-four million, five hundred twenty thousand, four hundred twenty-one".