66204769 has 4 divisors (see below), whose sum is σ = 66285460. Its totient is φ = 66124080.

The previous prime is 66204763. The next prime is 66204773. The reversal of 66204769 is 96740266.

66204769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53100369 + 13104400 = 7287^2 + 3620^2 .

It is a cyclic number.

It is not a de Polignac number, because 66204769 - 2¹⁹ = 65680481 is a prime.

It is a super-2 number, since 2×66204769² = 8766142876686722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66204763) 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 in 3 ways as a sum of consecutive naturals, for example, 39102 + ... + 40759.

It is an arithmetic number, because the mean of its divisors is an integer number (16571365).

Almost surely, 2^66204769 is an apocalyptic number.

It is an amenable number.

66204769 is a deficient number, since it is larger than the sum of its proper divisors (80691).

66204769 is an equidigital number, since it uses as much as digits as its factorization.

66204769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80690.

The product of its (nonzero) digits is 108864, while the sum is 40.

The square root of 66204769 is about 8136.6313053991. The cubic root of 66204769 is about 404.5415103142.

The spelling of 66204769 in words is "sixty-six million, two hundred four thousand, seven hundred sixty-nine".