66126769 has 2 divisors, whose sum is σ = 66126770. Its totient is φ = 66126768.

The previous prime is 66126701. The next prime is 66126799. The reversal of 66126769 is 96762166.

66126769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54937744 + 11189025 = 7412^2 + 3345^2 .

It is a cyclic number.

It is not a de Polignac number, because 66126769 - 2²¹ = 64029617 is a prime.

It is a super-2 number, since 2×66126769² = 8745499156758722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66126799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33063384 + 33063385.

It is an arithmetic number, because the mean of its divisors is an integer number (33063385).

Almost surely, 2^66126769 is an apocalyptic number.

It is an amenable number.

66126769 is a deficient number, since it is larger than the sum of its proper divisors (1).

66126769 is an equidigital number, since it uses as much as digits as its factorization.

66126769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 66126769 is about 8131.8367543870. The cubic root of 66126769 is about 404.3825759533.

The spelling of 66126769 in words is "sixty-six million, one hundred twenty-six thousand, seven hundred sixty-nine".