66551454589 has 2 divisors, whose sum is σ = 66551454590. Its totient is φ = 66551454588.

The previous prime is 66551454551. The next prime is 66551454623. The reversal of 66551454589 is 98545415566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66418052089 + 133402500 = 257717^2 + 11550^2 .

It is a cyclic number.

It is not a de Polignac number, because 66551454589 - 2⁷ = 66551454461 is a prime.

It is a super-2 number, since 2×66551454589² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66551454539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33275727294 + 33275727295.

It is an arithmetic number, because the mean of its divisors is an integer number (33275727295).

Almost surely, 2^66551454589 is an apocalyptic number.

It is an amenable number.

66551454589 is a deficient number, since it is larger than the sum of its proper divisors (1).

66551454589 is an equidigital number, since it uses as much as digits as its factorization.

66551454589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920000, while the sum is 58.

The spelling of 66551454589 in words is "sixty-six billion, five hundred fifty-one million, four hundred fifty-four thousand, five hundred eighty-nine".