63669887989 has 2 divisors, whose sum is σ = 63669887990. Its totient is φ = 63669887988.

The previous prime is 63669887947. The next prime is 63669888013. The reversal of 63669887989 is 98978896636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48283470225 + 15386417764 = 219735^2 + 124042^2 .

It is a cyclic number.

It is not a de Polignac number, because 63669887989 - 2³¹ = 61522404341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63669887189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31834943994 + 31834943995.

It is an arithmetic number, because the mean of its divisors is an integer number (31834943995).

Almost surely, 2^63669887989 is an apocalyptic number.

It is an amenable number.

63669887989 is a deficient number, since it is larger than the sum of its proper divisors (1).

63669887989 is an equidigital number, since it uses as much as digits as its factorization.

63669887989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693052928, while the sum is 79.

The spelling of 63669887989 in words is "sixty-three billion, six hundred sixty-nine million, eight hundred eighty-seven thousand, nine hundred eighty-nine".