651836989409 has 2 divisors, whose sum is σ = 651836989410. Its totient is φ = 651836989408.

The previous prime is 651836989361. The next prime is 651836989417. The reversal of 651836989409 is 904989638156.

651836989409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 608626221025 + 43210768384 = 780145^2 + 207872^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-651836989409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (651836989459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325918494704 + 325918494705.

It is an arithmetic number, because the mean of its divisors is an integer number (325918494705).

Almost surely, 2^651836989409 is an apocalyptic number.

It is an amenable number.

651836989409 is a deficient number, since it is larger than the sum of its proper divisors (1).

651836989409 is an equidigital number, since it uses as much as digits as its factorization.

651836989409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 100776960, while the sum is 68.

The spelling of 651836989409 in words is "six hundred fifty-one billion, eight hundred thirty-six million, nine hundred eighty-nine thousand, four hundred nine".