51553385509 has 2 divisors, whose sum is σ = 51553385510. Its totient is φ = 51553385508.

The previous prime is 51553385473. The next prime is 51553385531. The reversal of 51553385509 is 90558335515.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42231483009 + 9321902500 = 205503^2 + 96550^2 .

It is a cyclic number.

It is not a de Polignac number, because 51553385509 - 2¹⁹ = 51552861221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51553385599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25776692754 + 25776692755.

It is an arithmetic number, because the mean of its divisors is an integer number (25776692755).

Almost surely, 2^51553385509 is an apocalyptic number.

It is an amenable number.

51553385509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51553385509 is an equidigital number, since it uses as much as digits as its factorization.

51553385509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2025000, while the sum is 49.

The spelling of 51553385509 in words is "fifty-one billion, five hundred fifty-three million, three hundred eighty-five thousand, five hundred nine".