66719189 has 4 divisors (see below), whose sum is σ = 66743424. Its totient is φ = 66694956.

The previous prime is 66719173. The next prime is 66719239. The reversal of 66719189 is 98191766.

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 66719189 - 2⁴ = 66719173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66719119) 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, 7367 + ... + 13700.

It is an arithmetic number, because the mean of its divisors is an integer number (16685856).

Almost surely, 2^66719189 is an apocalyptic number.

It is an amenable number.

66719189 is a deficient number, since it is larger than the sum of its proper divisors (24235).

66719189 is a wasteful number, since it uses less digits than its factorization.

66719189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24234.

The product of its digits is 163296, while the sum is 47.

The square root of 66719189 is about 8168.1814989629. The cubic root of 66719189 is about 405.5865889001.

It can be divided in two parts, 66 and 719189, that multiplied together give a palindrome (47466474).

The spelling of 66719189 in words is "sixty-six million, seven hundred nineteen thousand, one hundred eighty-nine".