66981189 has 16 divisors (see below), whose sum is σ = 97574400. Its totient is φ = 40533360.

The previous prime is 66981169. The next prime is 66981191. The reversal of 66981189 is 98118966.

It is not a de Polignac number, because 66981189 - 2⁸ = 66980933 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66981169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30862 + ... + 32960.

It is an arithmetic number, because the mean of its divisors is an integer number (6098400).

Almost surely, 2^66981189 is an apocalyptic number.

It is an amenable number.

66981189 is a deficient number, since it is larger than the sum of its proper divisors (30593211).

66981189 is a wasteful number, since it uses less digits than its factorization.

66981189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080.

The product of its digits is 186624, while the sum is 48.

The square root of 66981189 is about 8184.2036264990. The cubic root of 66981189 is about 406.1167956502.

It can be divided in two parts, 6698 and 1189, that added together give a palindrome (7887).

The spelling of 66981189 in words is "sixty-six million, nine hundred eighty-one thousand, one hundred eighty-nine".