65211816025 has 12 divisors (see below), whose sum is σ = 81138642732. Its totient is φ = 51991394240.

The previous prime is 65211815993. The next prime is 65211816041. The reversal of 65211816025 is 52061811256.

It can be written as a sum of positive squares in 6 ways, for example, as 5243642569 + 59968173456 = 72413^2 + 244884^2 .

It is not a de Polignac number, because 65211816025 - 2⁵ = 65211815993 is a prime.

It is a Duffinian 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, 4443994 + ... + 4458643.

It is an arithmetic number, because the mean of its divisors is an integer number (6761553561).

Almost surely, 2^65211816025 is an apocalyptic number.

It is an amenable number.

65211816025 is a deficient number, since it is larger than the sum of its proper divisors (15926826707).

65211816025 is a wasteful number, since it uses less digits than its factorization.

65211816025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8902940 (or 8902935 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 65211816025 in words is "sixty-five billion, two hundred eleven million, eight hundred sixteen thousand, twenty-five".