65640165 has 8 divisors (see below), whose sum is σ = 105024288. Its totient is φ = 35008080.

The previous prime is 65640151. The next prime is 65640173. The reversal of 65640165 is 56104656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 65640165 - 2¹¹ = 65638117 is a prime.

It is a super-3 number, since 3×65640165³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2187991 + ... + 2188020.

It is an arithmetic number, because the mean of its divisors is an integer number (13128036).

Almost surely, 2^65640165 is an apocalyptic number.

It is an amenable number.

65640165 is a deficient number, since it is larger than the sum of its proper divisors (39384123).

65640165 is a wasteful number, since it uses less digits than its factorization.

65640165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376019.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 65640165 is about 8101.8618230626. The cubic root of 65640165 is about 403.3882291391.

The spelling of 65640165 in words is "sixty-five million, six hundred forty thousand, one hundred sixty-five".