66507769 has 2 divisors, whose sum is σ = 66507770. Its totient is φ = 66507768.

The previous prime is 66507761. The next prime is 66507787. The reversal of 66507769 is 96770566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65415744 + 1092025 = 8088^2 + 1045^2 .

It is a cyclic number.

It is not a de Polignac number, because 66507769 - 2³ = 66507761 is a prime.

It is a super-2 number, since 2×66507769² = 8846566674714722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66507761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33253884 + 33253885.

It is an arithmetic number, because the mean of its divisors is an integer number (33253885).

Almost surely, 2^66507769 is an apocalyptic number.

It is an amenable number.

66507769 is a deficient number, since it is larger than the sum of its proper divisors (1).

66507769 is an equidigital number, since it uses as much as digits as its factorization.

66507769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 476280, while the sum is 46.

The square root of 66507769 is about 8155.2295491911. The cubic root of 66507769 is about 405.1577275199.

It can be divided in two parts, 66507 and 769, that added together give a palindrome (67276).

The spelling of 66507769 in words is "sixty-six million, five hundred seven thousand, seven hundred sixty-nine".