65665005 has 32 divisors (see below), whose sum is σ = 120434688. Its totient is φ = 29928000.

The previous prime is 65664997. The next prime is 65665009. The reversal of 65665005 is 50056656.

It is not a de Polignac number, because 65665005 - 2³ = 65664997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65665009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44530 + ... + 45980.

It is an arithmetic number, because the mean of its divisors is an integer number (3763584).

Almost surely, 2^65665005 is an apocalyptic number.

It is an amenable number.

65665005 is a deficient number, since it is larger than the sum of its proper divisors (54769683).

65665005 is a wasteful number, since it uses less digits than its factorization.

65665005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 65665005 is about 8103.3946590303. The cubic root of 65665005 is about 403.4391070323.

The spelling of 65665005 in words is "sixty-five million, six hundred sixty-five thousand, five".