636552216550541 has 4 divisors (see below), whose sum is σ = 640231709131932. Its totient is φ = 632872723969152.

The previous prime is 636552216550387. The next prime is 636552216550589. The reversal of 636552216550541 is 145055612255636.

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 619530568517641 + 17021648032900 = 24890371^2 + 4125730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636552216550541 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 (636552216510541) 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, 1839746290436 + ... + 1839746290781.

It is an arithmetic number, because the mean of its divisors is an integer number (160057927282983).

Almost surely, 2^{636552216550541} is an apocalyptic number.

It is an amenable number.

636552216550541 is a deficient number, since it is larger than the sum of its proper divisors (3679492581391).

636552216550541 is a wasteful number, since it uses less digits than its factorization.

636552216550541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3679492581390.

The product of its (nonzero) digits is 32400000, while the sum is 56.

The spelling of 636552216550541 in words is "six hundred thirty-six trillion, five hundred fifty-two billion, two hundred sixteen million, five hundred fifty thousand, five hundred forty-one".