51553017947 has 2 divisors, whose sum is σ = 51553017948. Its totient is φ = 51553017946.

The previous prime is 51553017931. The next prime is 51553017961. The reversal of 51553017947 is 74971035515.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51553017947 - 2⁴ = 51553017931 is a prime.

It is not a weakly prime, because it can be changed into another prime (51553017907) 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, 25776508973 + 25776508974.

It is an arithmetic number, because the mean of its divisors is an integer number (25776508974).

Almost surely, 2^51553017947 is an apocalyptic number.

51553017947 is a deficient number, since it is larger than the sum of its proper divisors (1).

51553017947 is an equidigital number, since it uses as much as digits as its factorization.

51553017947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 661500, while the sum is 47.

The spelling of 51553017947 in words is "fifty-one billion, five hundred fifty-three million, seventeen thousand, nine hundred forty-seven".