66510140650 has 24 divisors (see below), whose sum is σ = 123748267104. Its totient is φ = 26595582000.

The previous prime is 66510140569. The next prime is 66510140677. The reversal of 66510140650 is 5604101566.

It is a happy number.

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, 52126 + ... + 368425.

It is an arithmetic number, because the mean of its divisors is an integer number (5156177796).

Almost surely, 2^66510140650 is an apocalyptic number.

66510140650 is a deficient number, since it is larger than the sum of its proper divisors (57238126454).

66510140650 is a wasteful number, since it uses less digits than its factorization.

66510140650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423726 (or 423721 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 66510140650 in words is "sixty-six billion, five hundred ten million, one hundred forty thousand, six hundred fifty".