66680787 has 4 divisors (see below), whose sum is σ = 88907720. Its totient is φ = 44453856.

The previous prime is 66680767. The next prime is 66680813. The reversal of 66680787 is 78708666.

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

It is not a de Polignac number, because 66680787 - 2⁶ = 66680723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66680717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11113462 + ... + 11113467.

It is an arithmetic number, because the mean of its divisors is an integer number (22226930).

Almost surely, 2^66680787 is an apocalyptic number.

66680787 is a deficient number, since it is larger than the sum of its proper divisors (22226933).

66680787 is a wasteful number, since it uses less digits than its factorization.

66680787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22226932.

The product of its (nonzero) digits is 677376, while the sum is 48.

The square root of 66680787 is about 8165.8304537873. The cubic root of 66680787 is about 405.5087585905.

The spelling of 66680787 in words is "sixty-six million, six hundred eighty thousand, seven hundred eighty-seven".