66725785 has 16 divisors (see below), whose sum is σ = 92100096. Its totient is φ = 45459648.

The previous prime is 66725779. The next prime is 66725801. The reversal of 66725785 is 58752766.

It is a cyclic number.

It is not a de Polignac number, because 66725785 - 2⁹ = 66725273 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 577 + ... + 11566.

It is an arithmetic number, because the mean of its divisors is an integer number (5756256).

Almost surely, 2^66725785 is an apocalyptic number.

It is an amenable number.

66725785 is a deficient number, since it is larger than the sum of its proper divisors (25374311).

66725785 is a wasteful number, since it uses less digits than its factorization.

66725785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12312.

The product of its digits is 705600, while the sum is 46.

The square root of 66725785 is about 8168.5852508253. The cubic root of 66725785 is about 405.5999541754.

The spelling of 66725785 in words is "sixty-six million, seven hundred twenty-five thousand, seven hundred eighty-five".