66551055650 has 24 divisors (see below), whose sum is σ = 123807273744. Its totient is φ = 26615624400.

The previous prime is 66551055617. The next prime is 66551055689. The reversal of 66551055650 is 5655015566.

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 11 ways as a sum of consecutive naturals, for example, 167045 + ... + 401255.

It is an arithmetic number, because the mean of its divisors is an integer number (5158636406).

Almost surely, 2^66551055650 is an apocalyptic number.

66551055650 is a deficient number, since it is larger than the sum of its proper divisors (57256218094).

66551055650 is a wasteful number, since it uses less digits than its factorization.

66551055650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239906 (or 239901 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 44.

The spelling of 66551055650 in words is "sixty-six billion, five hundred fifty-one million, fifty-five thousand, six hundred fifty".