66348889 has 2 divisors, whose sum is σ = 66348890. Its totient is φ = 66348888.

The previous prime is 66348869. The next prime is 66348911. The reversal of 66348889 is 98884366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61544025 + 4804864 = 7845^2 + 2192^2 .

It is a cyclic number.

It is not a de Polignac number, because 66348889 - 2⁷ = 66348761 is a prime.

It is not a weakly prime, because it can be changed into another prime (66348869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33174444 + 33174445.

It is an arithmetic number, because the mean of its divisors is an integer number (33174445).

Almost surely, 2^66348889 is an apocalyptic number.

It is an amenable number.

66348889 is a deficient number, since it is larger than the sum of its proper divisors (1).

66348889 is an equidigital number, since it uses as much as digits as its factorization.

66348889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1990656, while the sum is 52.

The square root of 66348889 is about 8145.4827358481. The cubic root of 66348889 is about 404.8348440046.

The spelling of 66348889 in words is "sixty-six million, three hundred forty-eight thousand, eight hundred eighty-nine".