66585765 has 16 divisors (see below), whose sum is σ = 107594496. Its totient is φ = 35160000.

The previous prime is 66585751. The next prime is 66585767. The reversal of 66585765 is 56758566.

It is not a de Polignac number, because 66585765 - 2⁴ = 66585749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66585767) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20461 + ... + 23490.

It is an arithmetic number, because the mean of its divisors is an integer number (6724656).

Almost surely, 2^66585765 is an apocalyptic number.

It is an amenable number.

66585765 is a deficient number, since it is larger than the sum of its proper divisors (41008731).

66585765 is a wasteful number, since it uses less digits than its factorization.

66585765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44060.

The product of its digits is 1512000, while the sum is 48.

The square root of 66585765 is about 8160.0101102879. The cubic root of 66585765 is about 405.3160465532.

The spelling of 66585765 in words is "sixty-six million, five hundred eighty-five thousand, seven hundred sixty-five".