66525799 has 4 divisors (see below), whose sum is σ = 66717864. Its totient is φ = 66333736.

The previous prime is 66525763. The next prime is 66525827. The reversal of 66525799 is 99752566.

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

It is a cyclic number.

It is not a de Polignac number, because 66525799 - 2⁷ = 66525671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66525299) 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, 95512 + ... + 96205.

It is an arithmetic number, because the mean of its divisors is an integer number (16679466).

Almost surely, 2^66525799 is an apocalyptic number.

66525799 is a deficient number, since it is larger than the sum of its proper divisors (192065).

66525799 is a wasteful number, since it uses less digits than its factorization.

66525799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192064.

The product of its digits is 1020600, while the sum is 49.

The square root of 66525799 is about 8156.3348999413. The cubic root of 66525799 is about 405.1943364450.

The spelling of 66525799 in words is "sixty-six million, five hundred twenty-five thousand, seven hundred ninety-nine".