4643644513261 has 6 divisors (see below), whose sum is σ = 5028325124010. Its totient is φ = 4286441089008.

The previous prime is 4643644513243. The next prime is 4643644513273. The reversal of 4643644513261 is 1623154463464.

It can be written as a sum of positive squares in 3 ways, for example, as 349192355625 + 4294452157636 = 590925^2 + 2072306^2 .

It is not a de Polignac number, because 4643644513261 - 2¹¹ = 4643644511213 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 (4643644513061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13738593066 + ... + 13738593403.

It is an arithmetic number, because the mean of its divisors is an integer number (838054187335).

Almost surely, 2^{4643644513261} is an apocalyptic number.

It is an amenable number.

4643644513261 is a deficient number, since it is larger than the sum of its proper divisors (384680610749).

4643644513261 is a wasteful number, since it uses less digits than its factorization.

4643644513261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27477186495 (or 27477186482 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 49.

The spelling of 4643644513261 in words is "four trillion, six hundred forty-three billion, six hundred forty-four million, five hundred thirteen thousand, two hundred sixty-one".