648412221762 has 18 divisors (see below), whose sum is σ = 1404900549273. Its totient is φ = 216136268472.

The previous prime is 648412221757. The next prime is 648412221803. The reversal of 648412221762 is 267122214846.

648412221762 is a `hidden beast` number, since 6 + 4 + 8 + 412 + 221 + 7 + 6 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 401384335401 + 247027886361 = 633549^2 + 497019^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=569391.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3321448 + ... + 3511244.

Almost surely, 2^648412221762 is an apocalyptic number.

648412221762 is an abundant number, since it is smaller than the sum of its proper divisors (756488327511).

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

648412221762 is an frugal number, since it uses more digits than its factorization.

648412221762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379602 (or 189802 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The spelling of 648412221762 in words is "six hundred forty-eight billion, four hundred twelve million, two hundred twenty-one thousand, seven hundred sixty-two".