66497769 has 24 divisors (see below), whose sum is σ = 106243592. Its totient is φ = 39813120.

The previous prime is 66497749. The next prime is 66497797. The reversal of 66497769 is 96779466.

It can be written as a sum of positive squares in 4 ways, for example, as 19053225 + 47444544 = 4365^2 + 6888^2 .

It is not a de Polignac number, because 66497769 - 2⁸ = 66497513 is a prime.

It is a super-2 number, since 2×66497769² = 8843906563954722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66497729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3352 + ... + 12009.

Almost surely, 2^66497769 is an apocalyptic number.

It is an amenable number.

66497769 is a deficient number, since it is larger than the sum of its proper divisors (39745823).

66497769 is a wasteful number, since it uses less digits than its factorization.

66497769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15417 (or 15414 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 54.

The square root of 66497769 is about 8154.6164226161. The cubic root of 66497769 is about 405.1374202164.

The spelling of 66497769 in words is "sixty-six million, four hundred ninety-seven thousand, seven hundred sixty-nine".