65660865005 has 4 divisors (see below), whose sum is σ = 78793038012. Its totient is φ = 52528692000.

The previous prime is 65660864999. The next prime is 65660865073. The reversal of 65660865005 is 50056806656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44132345929 + 21528519076 = 210077^2 + 146726^2 .

It is not a de Polignac number, because 65660865005 - 2⁸ = 65660864749 is a prime.

It is a super-2 number, since 2×65660865005² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6566086496 + ... + 6566086505.

It is an arithmetic number, because the mean of its divisors is an integer number (19698259503).

Almost surely, 2^65660865005 is an apocalyptic number.

It is an amenable number.

65660865005 is a deficient number, since it is larger than the sum of its proper divisors (13132173007).

65660865005 is a wasteful number, since it uses less digits than its factorization.

65660865005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13132173006.

The product of its (nonzero) digits is 1296000, while the sum is 47.

The spelling of 65660865005 in words is "sixty-five billion, six hundred sixty million, eight hundred sixty-five thousand, five".