66700785 has 16 divisors (see below), whose sum is σ = 106909056. Its totient is φ = 35511168.

The previous prime is 66700771. The next prime is 66700793. The reversal of 66700785 is 58700766.

It is not a de Polignac number, because 66700785 - 2⁶ = 66700721 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5652 + ... + 12858.

It is an arithmetic number, because the mean of its divisors is an integer number (6681816).

Almost surely, 2^66700785 is an apocalyptic number.

It is an amenable number.

66700785 is a deficient number, since it is larger than the sum of its proper divisors (40208271).

66700785 is a wasteful number, since it uses less digits than its factorization.

66700785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832.

The product of its (nonzero) digits is 70560, while the sum is 39.

The square root of 66700785 is about 8167.0548547197. The cubic root of 66700785 is about 405.5492927732.

The spelling of 66700785 in words is "sixty-six million, seven hundred thousand, seven hundred eighty-five".