5643644670421 has 4 divisors (see below), whose sum is σ = 5645238473644. Its totient is φ = 5642050867200.

The previous prime is 5643644670401. The next prime is 5643644670449. The reversal of 5643644670421 is 1240764463465.

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 1795495481521 + 3848149188900 = 1339961^2 + 1961670^2 .

It is a cyclic number.

It is not a de Polignac number, because 5643644670421 - 2²⁷ = 5643510452693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5643644670401) 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, 796896300 + ... + 796903381.

It is an arithmetic number, because the mean of its divisors is an integer number (1411309618411).

Almost surely, 2^{5643644670421} is an apocalyptic number.

It is an amenable number.

5643644670421 is a deficient number, since it is larger than the sum of its proper divisors (1593803223).

5643644670421 is a wasteful number, since it uses less digits than its factorization.

5643644670421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1593803222.

The product of its (nonzero) digits is 11612160, while the sum is 52.

The spelling of 5643644670421 in words is "five trillion, six hundred forty-three billion, six hundred forty-four million, six hundred seventy thousand, four hundred twenty-one".