4644640261 has 16 divisors (see below), whose sum is σ = 5094325440. Its totient is φ = 4214972160.

The previous prime is 4644640249. The next prime is 4644640279. The reversal of 4644640261 is 1620464464.

It is a cyclic number.

It is not a de Polignac number, because 4644640261 - 2⁹ = 4644639749 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 4644640261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4644640201) 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, 382006 + ... + 393976.

It is an arithmetic number, because the mean of its divisors is an integer number (318395340).

Almost surely, 2^4644640261 is an apocalyptic number.

It is an amenable number.

4644640261 is a deficient number, since it is larger than the sum of its proper divisors (449685179).

4644640261 is a wasteful number, since it uses less digits than its factorization.

4644640261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804.

The product of its (nonzero) digits is 110592, while the sum is 37.

The square root of 4644640261 is about 68151.5976408477. The cubic root of 4644640261 is about 1668.4659991736.

The spelling of 4644640261 in words is "four billion, six hundred forty-four million, six hundred forty thousand, two hundred sixty-one".