66905069 has 16 divisors (see below), whose sum is σ = 83707776. Its totient is φ = 51950400.

The previous prime is 66905063. The next prime is 66905087. The reversal of 66905069 is 96050966.

It is a cyclic number.

It is not a de Polignac number, because 66905069 - 2⁴ = 66905053 is a prime.

It is a super-2 number, since 2×66905069² = 8952576515789522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66905063) 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 15 ways as a sum of consecutive naturals, for example, 23039 + ... + 25779.

It is an arithmetic number, because the mean of its divisors is an integer number (5231736).

Almost surely, 2^66905069 is an apocalyptic number.

It is an amenable number.

66905069 is a deficient number, since it is larger than the sum of its proper divisors (16802707).

66905069 is a wasteful number, since it uses less digits than its factorization.

66905069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3076.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 66905069 is about 8179.5518825911. The cubic root of 66905069 is about 405.9628950859.

The spelling of 66905069 in words is "sixty-six million, nine hundred five thousand, sixty-nine".