51556522565501 has 2 divisors, whose sum is σ = 51556522565502. Its totient is φ = 51556522565500.

The previous prime is 51556522565477. The next prime is 51556522565531. The reversal of 51556522565501 is 10556522565515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51491459820025 + 65062745476 = 7175755^2 + 255074^2 .

It is a cyclic number.

It is not a de Polignac number, because 51556522565501 - 2⁴² = 47158476054397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51556522565531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25778261282750 + 25778261282751.

It is an arithmetic number, because the mean of its divisors is an integer number (25778261282751).

Almost surely, 2^{51556522565501} is an apocalyptic number.

It is an amenable number.

51556522565501 is a deficient number, since it is larger than the sum of its proper divisors (1).

51556522565501 is an equidigital number, since it uses as much as digits as its factorization.

51556522565501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11250000, while the sum is 53.

The spelling of 51556522565501 in words is "fifty-one trillion, five hundred fifty-six billion, five hundred twenty-two million, five hundred sixty-five thousand, five hundred one".