65990005 has 16 divisors (see below), whose sum is σ = 84049920. Its totient is φ = 49565952.

The previous prime is 65989999. The next prime is 65990009. The reversal of 65990005 is 50009956.

It is a cyclic number.

It is not a de Polignac number, because 65990005 - 2³ = 65989997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65990009) 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 15 ways as a sum of consecutive naturals, for example, 50956 + ... + 52234.

It is an arithmetic number, because the mean of its divisors is an integer number (5253120).

Almost surely, 2^65990005 is an apocalyptic number.

It is an amenable number.

65990005 is a deficient number, since it is larger than the sum of its proper divisors (18059915).

65990005 is a wasteful number, since it uses less digits than its factorization.

65990005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1908.

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 65990005 is about 8123.4232316186. The cubic root of 65990005 is about 404.1036009344.

The spelling of 65990005 in words is "sixty-five million, nine hundred ninety thousand, five".