65166510220325 has 12 divisors (see below), whose sum is σ = 80809231763940. Its totient is φ = 52131428117760.

The previous prime is 65166510220309. The next prime is 65166510220403. The reversal of 65166510220325 is 52302201566156.

It can be written as a sum of positive squares in 6 ways, for example, as 4835856087364 + 60330654132961 = 2199058^2 + 7767281^2 .

It is not a de Polignac number, because 65166510220325 - 2⁴ = 65166510220309 is a prime.

It is a congruent 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, 43754390 + ... + 45219239.

It is an arithmetic number, because the mean of its divisors is an integer number (6734102646995).

Almost surely, 2^{65166510220325} is an apocalyptic number.

It is an amenable number.

65166510220325 is a deficient number, since it is larger than the sum of its proper divisors (15642721543615).

65166510220325 is a wasteful number, since it uses less digits than its factorization.

65166510220325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89002936 (or 89002931 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 65166510220325 in words is "sixty-five trillion, one hundred sixty-six billion, five hundred ten million, two hundred twenty thousand, three hundred twenty-five".