66825169 has 4 divisors (see below), whose sum is σ = 66858496. Its totient is φ = 66791844.

The previous prime is 66825167. The next prime is 66825173. The reversal of 66825169 is 96152866.

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, and also an emirpimes, since its reverse is a distinct semiprime: 96152866 = 2 ⋅48076433.

It is a cyclic number.

It is not a de Polignac number, because 66825169 - 2¹ = 66825167 is a prime.

It is a super-2 number, since 2×66825169² = 8931206423757122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66825163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13449 + ... + 17734.

It is an arithmetic number, because the mean of its divisors is an integer number (16714624).

Almost surely, 2^66825169 is an apocalyptic number.

It is an amenable number.

66825169 is a deficient number, since it is larger than the sum of its proper divisors (33327).

66825169 is a wasteful number, since it uses less digits than its factorization.

66825169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33326.

The product of its digits is 155520, while the sum is 43.

The square root of 66825169 is about 8174.6662928832. Note that the first 3 decimals coincide. The cubic root of 66825169 is about 405.8012264383.

The spelling of 66825169 in words is "sixty-six million, eight hundred twenty-five thousand, one hundred sixty-nine".