66616590850 has 24 divisors (see below), whose sum is σ = 123923491380. Its totient is φ = 26643059520.

The previous prime is 66616590829. The next prime is 66616590857. The reversal of 66616590850 is 5809561666.

It can be written as a sum of positive squares in 6 ways, for example, as 48892727689 + 17723863161 = 221117^2 + 133131^2 .

It is not an unprimeable number, because it can be changed into a prime (66616590857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 303924 + ... + 474976.

Almost surely, 2^66616590850 is an apocalyptic number.

66616590850 is a deficient number, since it is larger than the sum of its proper divisors (57306900530).

66616590850 is a wasteful number, since it uses less digits than its factorization.

66616590850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178854 (or 178849 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 52.

The spelling of 66616590850 in words is "sixty-six billion, six hundred sixteen million, five hundred ninety thousand, eight hundred fifty".