63128551909 has 4 divisors (see below), whose sum is σ = 64319656716. Its totient is φ = 61937447104.

The previous prime is 63128551891. The next prime is 63128551919. The reversal of 63128551909 is 90915582136.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45086152225 + 18042399684 = 212335^2 + 134322^2 .

It is a cyclic number.

It is not a de Polignac number, because 63128551909 - 2⁵ = 63128551877 is a prime.

It is a super-2 number, since 2×63128551909² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63128551919) 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 in 3 ways as a sum of consecutive naturals, for example, 595552324 + ... + 595552429.

It is an arithmetic number, because the mean of its divisors is an integer number (16079914179).

Almost surely, 2^63128551909 is an apocalyptic number.

It is an amenable number.

63128551909 is a deficient number, since it is larger than the sum of its proper divisors (1191104807).

63128551909 is a wasteful number, since it uses less digits than its factorization.

63128551909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191104806.

The product of its (nonzero) digits is 583200, while the sum is 49.

The spelling of 63128551909 in words is "sixty-three billion, one hundred twenty-eight million, five hundred fifty-one thousand, nine hundred nine".