66523905 has 24 divisors (see below), whose sum is σ = 131781312. Its totient is φ = 30410784.

The previous prime is 66523903. The next prime is 66523927. The reversal of 66523905 is 50932566.

66523905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66523905 - 2¹ = 66523903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66523905.

It is not an unprimeable number, because it can be changed into a prime (66523903) 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 in 23 ways as a sum of consecutive naturals, for example, 105279 + ... + 105908.

It is an arithmetic number, because the mean of its divisors is an integer number (5490888).

Almost surely, 2^66523905 is an apocalyptic number.

It is an amenable number.

66523905 is a deficient number, since it is larger than the sum of its proper divisors (65257407).

66523905 is a wasteful number, since it uses less digits than its factorization.

66523905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211205 (or 211202 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 66523905 is about 8156.2187930437. The cubic root of 66523905 is about 405.1904910929.

The spelling of 66523905 in words is "sixty-six million, five hundred twenty-three thousand, nine hundred five".