15644303641 has 2 divisors, whose sum is σ = 15644303642. Its totient is φ = 15644303640.

The previous prime is 15644303639. The next prime is 15644303671. The reversal of 15644303641 is 14630344651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15040569600 + 603734041 = 122640^2 + 24571^2 .

It is a cyclic number.

It is not a de Polignac number, because 15644303641 - 2¹ = 15644303639 is a prime.

Together with 15644303639, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 15644303641.

It is not a weakly prime, because it can be changed into another prime (15644303671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7822151820 + 7822151821.

It is an arithmetic number, because the mean of its divisors is an integer number (7822151821).

Almost surely, 2^15644303641 is an apocalyptic number.

It is an amenable number.

15644303641 is a deficient number, since it is larger than the sum of its proper divisors (1).

15644303641 is an equidigital number, since it uses as much as digits as its factorization.

15644303641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 37.

The spelling of 15644303641 in words is "fifteen billion, six hundred forty-four million, three hundred three thousand, six hundred forty-one".