650577748985 has 16 divisors (see below), whose sum is σ = 801872035536. Its totient is φ = 506345810688.

The previous prime is 650577748981. The next prime is 650577748993. The reversal of 650577748985 is 589847775056.

It can be written as a sum of positive squares in 8 ways, for example, as 67926433129 + 582651315856 = 260627^2 + 763316^2 .

It is a cyclic number.

It is not a de Polignac number, because 650577748985 - 2² = 650577748981 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (650577748981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1770419 + ... + 2106071.

It is an arithmetic number, because the mean of its divisors is an integer number (50117002221).

Almost surely, 2^650577748985 is an apocalyptic number.

It is an amenable number.

650577748985 is a deficient number, since it is larger than the sum of its proper divisors (151294286551).

650577748985 is a wasteful number, since it uses less digits than its factorization.

650577748985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346172.

The product of its (nonzero) digits is 592704000, while the sum is 71.

Adding to 650577748985 its sum of digits (71), we get a square (650577749056 = 806584²).

The spelling of 650577748985 in words is "six hundred fifty billion, five hundred seventy-seven million, seven hundred forty-eight thousand, nine hundred eighty-five".