65557320193 has 8 divisors (see below), whose sum is σ = 66231635112. Its totient is φ = 64886255616.

The previous prime is 65557320161. The next prime is 65557320209. The reversal of 65557320193 is 39102375556.

It can be written as a sum of positive squares in 4 ways, for example, as 45025869249 + 20531450944 = 212193^2 + 143288^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65557320193 - 2⁵ = 65557320161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65557327193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 772030 + ... + 852727.

It is an arithmetic number, because the mean of its divisors is an integer number (8278954389).

Almost surely, 2^65557320193 is an apocalyptic number.

It is an amenable number.

65557320193 is a deficient number, since it is larger than the sum of its proper divisors (674314919).

65557320193 is a wasteful number, since it uses less digits than its factorization.

65557320193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1625171.

The product of its (nonzero) digits is 850500, while the sum is 46.

The spelling of 65557320193 in words is "sixty-five billion, five hundred fifty-seven million, three hundred twenty thousand, one hundred ninety-three".