66163789 has 2 divisors, whose sum is σ = 66163790. Its totient is φ = 66163788.

The previous prime is 66163753. The next prime is 66163793. The reversal of 66163789 is 98736166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39816100 + 26347689 = 6310^2 + 5133^2 .

It is a cyclic number.

It is not a de Polignac number, because 66163789 - 2¹³ = 66155597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66163729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33081894 + 33081895.

It is an arithmetic number, because the mean of its divisors is an integer number (33081895).

Almost surely, 2^66163789 is an apocalyptic number.

It is an amenable number.

66163789 is a deficient number, since it is larger than the sum of its proper divisors (1).

66163789 is an equidigital number, since it uses as much as digits as its factorization.

66163789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 46.

The square root of 66163789 is about 8134.1126744102. The cubic root of 66163789 is about 404.4580242196.

The spelling of 66163789 in words is "sixty-six million, one hundred sixty-three thousand, seven hundred eighty-nine".