63687418673 has 2 divisors, whose sum is σ = 63687418674. Its totient is φ = 63687418672.

The previous prime is 63687418661. The next prime is 63687418679. The reversal of 63687418673 is 37681478636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61579415104 + 2108003569 = 248152^2 + 45913^2 .

It is a cyclic number.

It is not a de Polignac number, because 63687418673 - 2³⁰ = 62613676849 is a prime.

It is not a weakly prime, because it can be changed into another prime (63687418679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31843709336 + 31843709337.

It is an arithmetic number, because the mean of its divisors is an integer number (31843709337).

Almost surely, 2^63687418673 is an apocalyptic number.

It is an amenable number.

63687418673 is a deficient number, since it is larger than the sum of its proper divisors (1).

63687418673 is an equidigital number, since it uses as much as digits as its factorization.

63687418673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24385536, while the sum is 59.

The spelling of 63687418673 in words is "sixty-three billion, six hundred eighty-seven million, four hundred eighteen thousand, six hundred seventy-three".