65165055571 has 32 divisors (see below), whose sum is σ = 86551884288. Its totient is φ = 47497674240.

The previous prime is 65165055499. The next prime is 65165055617. The reversal of 65165055571 is 17555056156.

It is a cyclic number.

It is not a de Polignac number, because 65165055571 - 2¹⁷ = 65164924499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65165053571) 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 31 ways as a sum of consecutive naturals, for example, 60661 + ... + 366073.

It is an arithmetic number, because the mean of its divisors is an integer number (2704746384).

Almost surely, 2^65165055571 is an apocalyptic number.

65165055571 is a deficient number, since it is larger than the sum of its proper divisors (21386828717).

65165055571 is a wasteful number, since it uses less digits than its factorization.

65165055571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305611.

The product of its (nonzero) digits is 787500, while the sum is 46.

The spelling of 65165055571 in words is "sixty-five billion, one hundred sixty-five million, fifty-five thousand, five hundred seventy-one".