64128808109 has 4 divisors (see below), whose sum is σ = 65215737120. Its totient is φ = 63041879100.

The previous prime is 64128808103. The next prime is 64128808129. The reversal of 64128808109 is 90180882146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64128808109 - 2²⁴ = 64112030893 is a prime.

It is a super-2 number, since 2×64128808109² (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 (64128808103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543464417 + ... + 543464534.

It is an arithmetic number, because the mean of its divisors is an integer number (16303934280).

Almost surely, 2^64128808109 is an apocalyptic number.

It is an amenable number.

64128808109 is a deficient number, since it is larger than the sum of its proper divisors (1086929011).

64128808109 is a wasteful number, since it uses less digits than its factorization.

64128808109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086929010.

The product of its (nonzero) digits is 221184, while the sum is 47.

The spelling of 64128808109 in words is "sixty-four billion, one hundred twenty-eight million, eight hundred eight thousand, one hundred nine".