66955489 has 2 divisors, whose sum is σ = 66955490. Its totient is φ = 66955488.

The previous prime is 66955457. The next prime is 66955513. The reversal of 66955489 is 98455966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43335889 + 23619600 = 6583^2 + 4860^2 .

It is a cyclic number.

It is not a de Polignac number, because 66955489 - 2⁵ = 66955457 is a prime.

It is not a weakly prime, because it can be changed into another prime (66952489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33477744 + 33477745.

It is an arithmetic number, because the mean of its divisors is an integer number (33477745).

Almost surely, 2^66955489 is an apocalyptic number.

It is an amenable number.

66955489 is a deficient number, since it is larger than the sum of its proper divisors (1).

66955489 is an equidigital number, since it uses as much as digits as its factorization.

66955489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 52.

The square root of 66955489 is about 8182.6333780758. The cubic root of 66955489 is about 406.0648480464.

The spelling of 66955489 in words is "sixty-six million, nine hundred fifty-five thousand, four hundred eighty-nine".