3640031536521 has 8 divisors (see below), whose sum is σ = 4853490676864. Its totient is φ = 2426630043600.

The previous prime is 3640031536507. The next prime is 3640031536523. The reversal of 3640031536521 is 1256351300463.

3640031536521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3640031536521 - 2¹⁵ = 3640031503753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3640031536521.

It is not an unprimeable number, because it can be changed into a prime (3640031536523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14264305 + ... + 14517246.

It is an arithmetic number, because the mean of its divisors is an integer number (606686334608).

Almost surely, 2^{3640031536521} is an apocalyptic number.

It is an amenable number.

3640031536521 is a deficient number, since it is larger than the sum of its proper divisors (1213459140343).

3640031536521 is a wasteful number, since it uses less digits than its factorization.

3640031536521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28823711.

The product of its (nonzero) digits is 194400, while the sum is 39.

Adding to 3640031536521 its reverse (1256351300463), we get a palindrome (4896382836984).

The spelling of 3640031536521 in words is "three trillion, six hundred forty billion, thirty-one million, five hundred thirty-six thousand, five hundred twenty-one".