66489131 has 2 divisors, whose sum is σ = 66489132. Its totient is φ = 66489130.

The previous prime is 66489127. The next prime is 66489133. The reversal of 66489131 is 13198466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66489131 - 2² = 66489127 is a prime.

It is a super-2 number, since 2×66489131² = 8841609082270322, which contains 22 as substring.

Together with 66489133, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66489133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33244565 + 33244566.

It is an arithmetic number, because the mean of its divisors is an integer number (33244566).

Almost surely, 2^66489131 is an apocalyptic number.

66489131 is a deficient number, since it is larger than the sum of its proper divisors (1).

66489131 is an equidigital number, since it uses as much as digits as its factorization.

66489131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 38.

The square root of 66489131 is about 8154.0867667692. The cubic root of 66489131 is about 405.1198771287.

The spelling of 66489131 in words is "sixty-six million, four hundred eighty-nine thousand, one hundred thirty-one".