64138105885 has 16 divisors (see below), whose sum is σ = 88344950400. Its totient is φ = 43788355776.

The previous prime is 64138105883. The next prime is 64138105907. The reversal of 64138105885 is 58850183146.

It is a cyclic number.

It is not a de Polignac number, because 64138105885 - 2¹ = 64138105883 is a prime.

It is a super-2 number, since 2×64138105885² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64138105883) 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 15 ways as a sum of consecutive naturals, for example, 3993115 + ... + 4009144.

It is an arithmetic number, because the mean of its divisors is an integer number (5521559400).

Almost surely, 2^64138105885 is an apocalyptic number.

It is an amenable number.

64138105885 is a deficient number, since it is larger than the sum of its proper divisors (24206844515).

64138105885 is a wasteful number, since it uses less digits than its factorization.

64138105885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8002500.

The product of its (nonzero) digits is 921600, while the sum is 49.

The spelling of 64138105885 in words is "sixty-four billion, one hundred thirty-eight million, one hundred five thousand, eight hundred eighty-five".