64815523 has 2 divisors, whose sum is σ = 64815524. Its totient is φ = 64815522.

The previous prime is 64815511. The next prime is 64815559. The reversal of 64815523 is 32551846.

64815523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64815523 - 2⁹ = 64815011 is a prime.

It is not a weakly prime, because it can be changed into another prime (64815323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32407761 + 32407762.

It is an arithmetic number, because the mean of its divisors is an integer number (32407762).

Almost surely, 2^64815523 is an apocalyptic number.

64815523 is a deficient number, since it is larger than the sum of its proper divisors (1).

64815523 is an equidigital number, since it uses as much as digits as its factorization.

64815523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28800, while the sum is 34.

The square root of 64815523 is about 8050.8088413525. The cubic root of 64815523 is about 401.6918403518.

The spelling of 64815523 in words is "sixty-four million, eight hundred fifteen thousand, five hundred twenty-three".