65651985 has 32 divisors (see below), whose sum is σ = 133390080. Its totient is φ = 30011904.

The previous prime is 65651953. The next prime is 65651987. The reversal of 65651985 is 58915656.

It is a happy number.

65651985 is a `hidden beast` number, since 6 + 56 + 519 + 85 = 666.

65651985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65651985 - 2⁵ = 65651953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 65651985.

It is not an unprimeable number, because it can be changed into a prime (65651987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33792 + ... + 35681.

It is an arithmetic number, because the mean of its divisors is an integer number (4168440).

Almost surely, 2^65651985 is an apocalyptic number.

It is an amenable number.

65651985 is an abundant number, since it is smaller than the sum of its proper divisors (67738095).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65651985 is a wasteful number, since it uses less digits than its factorization.

65651985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69494 (or 69488 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 65651985 is about 8102.5912521859. The cubic root of 65651985 is about 403.4124407515.

The spelling of 65651985 in words is "sixty-five million, six hundred fifty-one thousand, nine hundred eighty-five".