65666226105520 has 40 divisors (see below), whose sum is σ = 152675657842320. Its totient is φ = 26266201040640.

The previous prime is 65666226105517. The next prime is 65666226105521. The reversal of 65666226105520 is 2550162266656.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (65666226105521) 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, 2859226 + ... + 11811334.

It is an arithmetic number, because the mean of its divisors is an integer number (3816891446058).

Almost surely, 2^{65666226105520} is an apocalyptic number.

It is an amenable number.

65666226105520 is an abundant number, since it is smaller than the sum of its proper divisors (87009431736800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65666226105520 is a wasteful number, since it uses less digits than its factorization.

65666226105520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9043813 (or 9043807 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 52.

The spelling of 65666226105520 in words is "sixty-five trillion, six hundred sixty-six billion, two hundred twenty-six million, one hundred five thousand, five hundred twenty".