65616672016685 has 16 divisors (see below), whose sum is σ = 78917310451632. Its totient is φ = 52375149504000.

The previous prime is 65616672016639. The next prime is 65616672016723. The reversal of 65616672016685 is 58661027661656.

It can be written as a sum of positive squares in 8 ways, for example, as 31432046132041 + 34184625884644 = 5606429^2 + 5846762^2 .

It is not a de Polignac number, because 65616672016685 - 2³² = 65612377049389 is a prime.

It is a Smith number, since the sum of its digits (65) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35430815 + ... + 37236755.

It is an arithmetic number, because the mean of its divisors is an integer number (4932331903227).

Almost surely, 2^{65616672016685} is an apocalyptic number.

It is an amenable number.

65616672016685 is a deficient number, since it is larger than the sum of its proper divisors (13300638434947).

65616672016685 is a wasteful number, since it uses less digits than its factorization.

65616672016685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822304.

The product of its (nonzero) digits is 130636800, while the sum is 65.

The spelling of 65616672016685 in words is "sixty-five trillion, six hundred sixteen billion, six hundred seventy-two million, sixteen thousand, six hundred eighty-five".