66117806050 has 24 divisors (see below), whose sum is σ = 123689997396. Its totient is φ = 26294245440.

The previous prime is 66117806039. The next prime is 66117806077. The reversal of 66117806050 is 5060871166.

It can be written as a sum of positive squares in 6 ways, for example, as 53930308441 + 12187497609 = 232229^2 + 110397^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66117805994 and 66117806012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3813189 + ... + 3830488.

Almost surely, 2^66117806050 is an apocalyptic number.

66117806050 is a deficient number, since it is larger than the sum of its proper divisors (57572191346).

66117806050 is a wasteful number, since it uses less digits than its factorization.

66117806050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7643862 (or 7643857 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 40.

The spelling of 66117806050 in words is "sixty-six billion, one hundred seventeen million, eight hundred six thousand, fifty".