64827117938 has 16 divisors (see below), whose sum is σ = 108668075040. Its totient is φ = 28748167200.

The previous prime is 64827117937. The next prime is 64827117973. The reversal of 64827117938 is 83971172846.

It is a super-2 number, since 2×64827117938² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64827117937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35934308 + ... + 35936111.

It is an arithmetic number, because the mean of its divisors is an integer number (6791754690).

Almost surely, 2^64827117938 is an apocalyptic number.

64827117938 is a deficient number, since it is larger than the sum of its proper divisors (43840957102).

64827117938 is a wasteful number, since it uses less digits than its factorization.

64827117938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71870473.

The product of its digits is 4064256, while the sum is 56.

The spelling of 64827117938 in words is "sixty-four billion, eight hundred twenty-seven million, one hundred seventeen thousand, nine hundred thirty-eight".