478978502369 has 2 divisors, whose sum is σ = 478978502370. Its totient is φ = 478978502368.

The previous prime is 478978502363. The next prime is 478978502531. The reversal of 478978502369 is 963205879874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 447795180625 + 31183321744 = 669175^2 + 176588^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478978502369 is a prime.

It is a super-2 number, since 2×478978502369² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 478978502299 and 478978502308.

It is not a weakly prime, because it can be changed into another prime (478978502363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239489251184 + 239489251185.

It is an arithmetic number, because the mean of its divisors is an integer number (239489251185).

Almost surely, 2^478978502369 is an apocalyptic number.

It is an amenable number.

478978502369 is a deficient number, since it is larger than the sum of its proper divisors (1).

478978502369 is an equidigital number, since it uses as much as digits as its factorization.

478978502369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182891520, while the sum is 68.

The spelling of 478978502369 in words is "four hundred seventy-eight billion, nine hundred seventy-eight million, five hundred two thousand, three hundred sixty-nine".