5645043256021 has 4 divisors (see below), whose sum is σ = 6079277352652. Its totient is φ = 5210809159392.

The previous prime is 5645043255979. The next prime is 5645043256031. The reversal of 5645043256021 is 1206523405465.

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 2240667696996 + 3404375559025 = 1496886^2 + 1845095^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645043256021 - 2¹³ = 5645043247829 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 (5645043256031) 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, 217117048296 + ... + 217117048321.

It is an arithmetic number, because the mean of its divisors is an integer number (1519819338163).

Almost surely, 2^{5645043256021} is an apocalyptic number.

It is an amenable number.

5645043256021 is a deficient number, since it is larger than the sum of its proper divisors (434234096631).

5645043256021 is a wasteful number, since it uses less digits than its factorization.

5645043256021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434234096630.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 5645043256021 in words is "five trillion, six hundred forty-five billion, forty-three million, two hundred fifty-six thousand, twenty-one".