51663354541 has 2 divisors, whose sum is σ = 51663354542. Its totient is φ = 51663354540.

The previous prime is 51663354503. The next prime is 51663354559. The reversal of 51663354541 is 14545336615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51640744516 + 22610025 = 227246^2 + 4755^2 .

It is a cyclic number.

It is not a de Polignac number, because 51663354541 - 2¹¹ = 51663352493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51663354641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25831677270 + 25831677271.

It is an arithmetic number, because the mean of its divisors is an integer number (25831677271).

Almost surely, 2^51663354541 is an apocalyptic number.

It is an amenable number.

51663354541 is a deficient number, since it is larger than the sum of its proper divisors (1).

51663354541 is an equidigital number, since it uses as much as digits as its factorization.

51663354541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 51663354541 in words is "fifty-one billion, six hundred sixty-three million, three hundred fifty-four thousand, five hundred forty-one".