650736621 has 6 divisors (see below), whose sum is σ = 939952910. Its totient is φ = 433824408.

The previous prime is 650736617. The next prime is 650736679. The reversal of 650736621 is 126637056.

It can be written as a sum of positive squares in only one way, i.e., 487791396 + 162945225 = 22086^2 + 12765^2 .

It is not a de Polignac number, because 650736621 - 2² = 650736617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (650736721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36152026 + ... + 36152043.

Almost surely, 2^650736621 is an apocalyptic number.

It is an amenable number.

650736621 is a deficient number, since it is larger than the sum of its proper divisors (289216289).

650736621 is a wasteful number, since it uses less digits than its factorization.

650736621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72304075 (or 72304072 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 650736621 is about 25509.5398037675. The cubic root of 650736621 is about 866.5662074057.

The spelling of 650736621 in words is "six hundred fifty million, seven hundred thirty-six thousand, six hundred twenty-one".