66717189 has 80 divisors (see below), whose sum is σ = 131028480. Its totient is φ = 32775840.

The previous prime is 66717187. The next prime is 66717199. The reversal of 66717189 is 98171766.

It is not a de Polignac number, because 66717189 - 2¹ = 66717187 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717187) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 118222 + ... + 118784.

It is an arithmetic number, because the mean of its divisors is an integer number (1637856).

Almost surely, 2^66717189 is an apocalyptic number.

It is an amenable number.

66717189 is a deficient number, since it is larger than the sum of its proper divisors (64311291).

66717189 is a wasteful number, since it uses less digits than its factorization.

66717189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 603 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 66717189 is about 8168.0590717746. The cubic root of 66717189 is about 405.5825361866.

The spelling of 66717189 in words is "sixty-six million, seven hundred seventeen thousand, one hundred eighty-nine".