65500555621165 has 12 divisors (see below), whose sum is σ = 91433428663356. Its totient is φ = 44914666711488.

The previous prime is 65500555621159. The next prime is 65500555621313. The reversal of 65500555621165 is 56112655500556.

It can be written as a sum of positive squares in 2 ways, for example, as 45312257547844 + 20188298073321 = 6731438^2 + 4493139^2 .

It is not a de Polignac number, because 65500555621165 - 2¹⁷ = 65500555490093 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 133674603064 + ... + 133674603553.

It is an arithmetic number, because the mean of its divisors is an integer number (7619452388613).

Almost surely, 2^{65500555621165} is an apocalyptic number.

It is an amenable number.

65500555621165 is a deficient number, since it is larger than the sum of its proper divisors (25932873042191).

65500555621165 is a wasteful number, since it uses less digits than its factorization.

65500555621165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267349206636 (or 267349206629 counting only the distinct ones).

The product of its (nonzero) digits is 6750000, while the sum is 52.

The spelling of 65500555621165 in words is "sixty-five trillion, five hundred billion, five hundred fifty-five million, six hundred twenty-one thousand, one hundred sixty-five".