650702122121 has 4 divisors (see below), whose sum is σ = 650727980100. Its totient is φ = 650676264144.

The previous prime is 650702122069. The next prime is 650702122151. The reversal of 650702122121 is 121221207056.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 490930040896 + 159772081225 = 700664^2 + 399715^2 .

It is a cyclic number.

It is not a de Polignac number, because 650702122121 - 2²⁶ = 650635013257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (650702122151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12891206 + ... + 12941583.

It is an arithmetic number, because the mean of its divisors is an integer number (162681995025).

Almost surely, 2^650702122121 is an apocalyptic number.

It is an amenable number.

650702122121 is a deficient number, since it is larger than the sum of its proper divisors (25857979).

650702122121 is a wasteful number, since it uses less digits than its factorization.

650702122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25857978.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 650702122121 its reverse (121221207056), we get a palindrome (771923329177).

The spelling of 650702122121 in words is "six hundred fifty billion, seven hundred two million, one hundred twenty-two thousand, one hundred twenty-one".