51015561503 has 2 divisors, whose sum is σ = 51015561504. Its totient is φ = 51015561502.

The previous prime is 51015561481. The next prime is 51015561517. The reversal of 51015561503 is 30516551015.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51015561503 - 2¹⁸ = 51015299359 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51015561503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51015561533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25507780751 + 25507780752.

It is an arithmetic number, because the mean of its divisors is an integer number (25507780752).

Almost surely, 2^51015561503 is an apocalyptic number.

51015561503 is a deficient number, since it is larger than the sum of its proper divisors (1).

51015561503 is an equidigital number, since it uses as much as digits as its factorization.

51015561503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11250, while the sum is 32.

The spelling of 51015561503 in words is "fifty-one billion, fifteen million, five hundred sixty-one thousand, five hundred three".