66666535 has 32 divisors (see below), whose sum is σ = 94671360. Its totient is φ = 44592768.

The previous prime is 66666517. The next prime is 66666557. The reversal of 66666535 is 53566666.

It is a happy number.

66666535 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 66666535 - 2⁹ = 66666023 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66666491 and 66666500.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 27232 + ... + 29578.

It is an arithmetic number, because the mean of its divisors is an integer number (2958480).

Almost surely, 2^66666535 is an apocalyptic number.

66666535 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66666535 is a deficient number, since it is larger than the sum of its proper divisors (28004825).

66666535 is a wasteful number, since it uses less digits than its factorization.

66666535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2407.

The product of its digits is 583200, while the sum is 43.

The square root of 66666535 is about 8164.9577463695. The cubic root of 66666535 is about 405.4798660970.

The spelling of 66666535 in words is "sixty-six million, six hundred sixty-six thousand, five hundred thirty-five".