66905339 has 4 divisors (see below), whose sum is σ = 66922824. Its totient is φ = 66887856.

The previous prime is 66905323. The next prime is 66905341. The reversal of 66905339 is 93350966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66905339 - 2⁴ = 66905323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66905296 and 66905305.

It is not an unprimeable number, because it can be changed into a prime (66935339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257 + ... + 11570.

It is an arithmetic number, because the mean of its divisors is an integer number (16730706).

Almost surely, 2^66905339 is an apocalyptic number.

66905339 is a deficient number, since it is larger than the sum of its proper divisors (17485).

66905339 is a wasteful number, since it uses less digits than its factorization.

66905339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17484.

The product of its (nonzero) digits is 131220, while the sum is 41.

The square root of 66905339 is about 8179.5683871461. The cubic root of 66905339 is about 405.9634411822.

The spelling of 66905339 in words is "sixty-six million, nine hundred five thousand, three hundred thirty-nine".