51903344621 has 2 divisors, whose sum is σ = 51903344622. Its totient is φ = 51903344620.

The previous prime is 51903344599. The next prime is 51903344627. The reversal of 51903344621 is 12644330915.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45876927721 + 6026416900 = 214189^2 + 77630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51903344621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51903344627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25951672310 + 25951672311.

It is an arithmetic number, because the mean of its divisors is an integer number (25951672311).

Almost surely, 2^51903344621 is an apocalyptic number.

It is an amenable number.

51903344621 is a deficient number, since it is larger than the sum of its proper divisors (1).

51903344621 is an equidigital number, since it uses as much as digits as its factorization.

51903344621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The spelling of 51903344621 in words is "fifty-one billion, nine hundred three million, three hundred forty-four thousand, six hundred twenty-one".