66700189 has 4 divisors (see below), whose sum is σ = 68851840. Its totient is φ = 64548540.

The previous prime is 66700177. The next prime is 66700201. The reversal of 66700189 is 98100766.

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: 98100766 = 2 ⋅49050383.

It is an interprime number because it is at equal distance from previous prime (66700177) and next prime (66700201).

It is a cyclic number.

It is not a de Polignac number, because 66700189 - 2¹¹ = 66698141 is a prime.

It is a super-3 number, since 3×66700189³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66400189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1075779 + ... + 1075840.

It is an arithmetic number, because the mean of its divisors is an integer number (17212960).

Almost surely, 2^66700189 is an apocalyptic number.

It is an amenable number.

66700189 is a deficient number, since it is larger than the sum of its proper divisors (2151651).

66700189 is a wasteful number, since it uses less digits than its factorization.

66700189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2151650.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 66700189 is about 8167.0183665766. The cubic root of 66700189 is about 405.5480848509.

The spelling of 66700189 in words is "sixty-six million, seven hundred thousand, one hundred eighty-nine".