63889687457 has 2 divisors, whose sum is σ = 63889687458. Its totient is φ = 63889687456.

The previous prime is 63889687447. The next prime is 63889687469. The reversal of 63889687457 is 75478698836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63169784896 + 719902561 = 251336^2 + 26831^2 .

It is a cyclic number.

It is not a de Polignac number, because 63889687457 - 2¹⁶ = 63889621921 is a prime.

It is not a weakly prime, because it can be changed into another prime (63889687427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31944843728 + 31944843729.

It is an arithmetic number, because the mean of its divisors is an integer number (31944843729).

Almost surely, 2^63889687457 is an apocalyptic number.

It is an amenable number.

63889687457 is a deficient number, since it is larger than the sum of its proper divisors (1).

63889687457 is an equidigital number, since it uses as much as digits as its factorization.

63889687457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 487710720, while the sum is 71.

The spelling of 63889687457 in words is "sixty-three billion, eight hundred eighty-nine million, six hundred eighty-seven thousand, four hundred fifty-seven".