66200406642 has 24 divisors (see below), whose sum is σ = 143716030380. Its totient is φ = 22023445920.

The previous prime is 66200406631. The next prime is 66200406683. The reversal of 66200406642 is 24660400266.

66200406642 is a `hidden beast` number, since 6 + 6 + 2 + 0 + 0 + 4 + 0 + 6 + 642 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 63378566001 + 2821840641 = 251751^2 + 53121^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66200406597 and 66200406606.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3603609 + ... + 3621932.

Almost surely, 2^66200406642 is an apocalyptic number.

66200406642 is an abundant number, since it is smaller than the sum of its proper divisors (77515623738).

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

66200406642 is a wasteful number, since it uses less digits than its factorization.

66200406642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7226058 (or 7226055 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The spelling of 66200406642 in words is "sixty-six billion, two hundred million, four hundred six thousand, six hundred forty-two".