6478978523 has 2 divisors, whose sum is σ = 6478978524. Its totient is φ = 6478978522.

The previous prime is 6478978501. The next prime is 6478978531. The reversal of 6478978523 is 3258798746.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6478978523 - 2⁶ = 6478978459 is a prime.

It is not a weakly prime, because it can be changed into another prime (6478978553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3239489261 + 3239489262.

It is an arithmetic number, because the mean of its divisors is an integer number (3239489262).

Almost surely, 2^6478978523 is an apocalyptic number.

6478978523 is a deficient number, since it is larger than the sum of its proper divisors (1).

6478978523 is an equidigital number, since it uses as much as digits as its factorization.

6478978523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20321280, while the sum is 59.

The square root of 6478978523 is about 80492.1022399092. The cubic root of 6478978523 is about 1864.2415364942.

The spelling of 6478978523 in words is "six billion, four hundred seventy-eight million, nine hundred seventy-eight thousand, five hundred twenty-three".