5640563236521 has 16 divisors (see below), whose sum is σ = 7802763775488. Its totient is φ = 3620600592000.

The previous prime is 5640563236489. The next prime is 5640563236577. The reversal of 5640563236521 is 1256323650465.

It is a happy number.

It is not a de Polignac number, because 5640563236521 - 2⁵ = 5640563236489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5640563216521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153918780 + ... + 153955421.

It is an arithmetic number, because the mean of its divisors is an integer number (487672735968).

Almost surely, 2^{5640563236521} is an apocalyptic number.

It is an amenable number.

5640563236521 is a deficient number, since it is larger than the sum of its proper divisors (2162200538967).

5640563236521 is a wasteful number, since it uses less digits than its factorization.

5640563236521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307874432.

The product of its (nonzero) digits is 3888000, while the sum is 48.

Adding to 5640563236521 its reverse (1256323650465), we get a palindrome (6896886886986).

The spelling of 5640563236521 in words is "five trillion, six hundred forty billion, five hundred sixty-three million, two hundred thirty-six thousand, five hundred twenty-one".