66199777250 has 32 divisors (see below), whose sum is σ = 125957585520. Its totient is φ = 26045808000.

The previous prime is 66199777247. The next prime is 66199777279. The reversal of 66199777250 is 5277799166.

It can be written as a sum of positive squares in 8 ways, for example, as 2125486609 + 64074290641 = 46103^2 + 253129^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66199777250.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2155235 + ... + 2185734.

Almost surely, 2^66199777250 is an apocalyptic number.

66199777250 is a deficient number, since it is larger than the sum of its proper divisors (59757808270).

66199777250 is a wasteful number, since it uses less digits than its factorization.

66199777250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4341047 (or 4341037 counting only the distinct ones).

The product of its (nonzero) digits is 10001880, while the sum is 59.

The spelling of 66199777250 in words is "sixty-six billion, one hundred ninety-nine million, seven hundred seventy-seven thousand, two hundred fifty".