66706169 has 4 divisors (see below), whose sum is σ = 70217040. Its totient is φ = 63195300.

The previous prime is 66706163. The next prime is 66706183. The reversal of 66706169 is 96160766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66706169 - 2⁸ = 66705913 is a prime.

It is a super-2 number, since 2×66706169² = 8899425965313122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66706163) 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, 1755407 + ... + 1755444.

It is an arithmetic number, because the mean of its divisors is an integer number (17554260).

Almost surely, 2^66706169 is an apocalyptic number.

It is an amenable number.

66706169 is a deficient number, since it is larger than the sum of its proper divisors (3510871).

66706169 is a wasteful number, since it uses less digits than its factorization.

66706169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510870.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 66706169 is about 8167.3844650537. The cubic root of 66706169 is about 405.5602042822.

The spelling of 66706169 in words is "sixty-six million, seven hundred six thousand, one hundred sixty-nine".