65665016525 has 12 divisors (see below), whose sum is σ = 81492909492. Its totient is φ = 52487955840.

The previous prime is 65665016503. The next prime is 65665016569. The reversal of 65665016525 is 52561056656.

It can be written as a sum of positive squares in 6 ways, for example, as 7681821316 + 57983195209 = 87646^2 + 240797^2 .

It is not a de Polignac number, because 65665016525 - 2⁸ = 65665016269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65665016525.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1071014 + ... + 1130663.

It is an arithmetic number, because the mean of its divisors is an integer number (6791075791).

Almost surely, 2^65665016525 is an apocalyptic number.

It is an amenable number.

65665016525 is a deficient number, since it is larger than the sum of its proper divisors (15827892967).

65665016525 is a wasteful number, since it uses less digits than its factorization.

65665016525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202880 (or 2202875 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 47.

The spelling of 65665016525 in words is "sixty-five billion, six hundred sixty-five million, sixteen thousand, five hundred twenty-five".