66799529 has 4 divisors (see below), whose sum is σ = 67091460. Its totient is φ = 66507600.

The previous prime is 66799493. The next prime is 66799547. The reversal of 66799529 is 92599766.

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 62047129 + 4752400 = 7877^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 66799529 - 2¹² = 66795433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66799559) 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 3 ways as a sum of consecutive naturals, for example, 145622 + ... + 146079.

It is an arithmetic number, because the mean of its divisors is an integer number (16772865).

Almost surely, 2^66799529 is an apocalyptic number.

It is an amenable number.

66799529 is a deficient number, since it is larger than the sum of its proper divisors (291931).

66799529 is a wasteful number, since it uses less digits than its factorization.

66799529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291930.

The product of its digits is 1837080, while the sum is 53.

The square root of 66799529 is about 8173.0978826881. The cubic root of 66799529 is about 405.7493194766.

The spelling of 66799529 in words is "sixty-six million, seven hundred ninety-nine thousand, five hundred twenty-nine".