66173121050 has 24 divisors (see below), whose sum is σ = 123105889692. Its totient is φ = 26464112000.

The previous prime is 66173120987. The next prime is 66173121073. The reversal of 66173121050 is 5012137166.

66173121050 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 10420938889 + 55752182161 = 102083^2 + 236119^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66173120998 and 66173121016.

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, 137270 + ... + 388830.

Almost surely, 2^66173121050 is an apocalyptic number.

66173121050 is a deficient number, since it is larger than the sum of its proper divisors (56932768642).

66173121050 is a wasteful number, since it uses less digits than its factorization.

66173121050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256834 (or 256829 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 66173121050 in words is "sixty-six billion, one hundred seventy-three million, one hundred twenty-one thousand, fifty".