65125709 has 18 divisors (see below), whose sum is σ = 73297098. Its totient is φ = 57816000.

The previous prime is 65125681. The next prime is 65125717. The reversal of 65125709 is 90752156.

It can be written as a sum of positive squares in 3 ways, for example, as 30492484 + 34633225 = 5522^2 + 5885^2 .

It is a de Polignac number, because none of the positive numbers 2^k-65125709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65125729) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 644759 + ... + 644859.

It is an arithmetic number, because the mean of its divisors is an integer number (4072061).

Almost surely, 2^65125709 is an apocalyptic number.

It is an amenable number.

65125709 is a deficient number, since it is larger than the sum of its proper divisors (8171389).

65125709 is a wasteful number, since it uses less digits than its factorization.

65125709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 65125709 is about 8070.0501237601. The cubic root of 65125709 is about 402.3316096668.

It can be divided in two parts, 6512 and 5709, that added together give a palindrome (12221).

The spelling of 65125709 in words is "sixty-five million, one hundred twenty-five thousand, seven hundred nine".