66769009 has 4 divisors (see below), whose sum is σ = 68922880. Its totient is φ = 64615140.

The previous prime is 66768971. The next prime is 66769019. The reversal of 66769009 is 90096766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66769009 - 2⁷ = 66768881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66769019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076889 + ... + 1076950.

It is an arithmetic number, because the mean of its divisors is an integer number (17230720).

Almost surely, 2^66769009 is an apocalyptic number.

It is an amenable number.

66769009 is a deficient number, since it is larger than the sum of its proper divisors (2153871).

66769009 is a wasteful number, since it uses less digits than its factorization.

66769009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153870.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 66769009 is about 8171.2305682804. The cubic root of 66769009 is about 405.6875158689.

The spelling of 66769009 in words is "sixty-six million, seven hundred sixty-nine thousand, nine".