51660641356463 has 2 divisors, whose sum is σ = 51660641356464. Its totient is φ = 51660641356462.

The previous prime is 51660641356439. The next prime is 51660641356469. The reversal of 51660641356463 is 36465314606615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51660641356463 - 2¹⁸ = 51660641094319 is a prime.

It is a super-2 number, since 2×51660641356463² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51660641356399 and 51660641356408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51660641356469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25830320678231 + 25830320678232.

It is an arithmetic number, because the mean of its divisors is an integer number (25830320678232).

Almost surely, 2^{51660641356463} is an apocalyptic number.

51660641356463 is a deficient number, since it is larger than the sum of its proper divisors (1).

51660641356463 is an equidigital number, since it uses as much as digits as its factorization.

51660641356463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 51660641356463 in words is "fifty-one trillion, six hundred sixty billion, six hundred forty-one million, three hundred fifty-six thousand, four hundred sixty-three".