15478444313 has 2 divisors, whose sum is σ = 15478444314. Its totient is φ = 15478444312.

The previous prime is 15478444309. The next prime is 15478444339. The reversal of 15478444313 is 31344487451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11844404224 + 3634040089 = 108832^2 + 60283^2 .

It is a cyclic number.

It is not a de Polignac number, because 15478444313 - 2² = 15478444309 is a prime.

It is not a weakly prime, because it can be changed into another prime (15478444363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7739222156 + 7739222157.

It is an arithmetic number, because the mean of its divisors is an integer number (7739222157).

Almost surely, 2^15478444313 is an apocalyptic number.

It is an amenable number.

15478444313 is a deficient number, since it is larger than the sum of its proper divisors (1).

15478444313 is an equidigital number, since it uses as much as digits as its factorization.

15478444313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 44.

The spelling of 15478444313 in words is "fifteen billion, four hundred seventy-eight million, four hundred forty-four thousand, three hundred thirteen".