64381855105 has 8 divisors (see below), whose sum is σ = 78054703272. Its totient is φ = 50974499328.

The previous prime is 64381855103. The next prime is 64381855123. The reversal of 64381855105 is 50155818346.

It can be written as a sum of positive squares in 4 ways, for example, as 1067720976 + 63314134129 = 32676^2 + 251623^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64381855105 - 2¹ = 64381855103 is a prime.

It is a super-2 number, since 2×64381855105² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64381855103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66372562 + ... + 66373531.

It is an arithmetic number, because the mean of its divisors is an integer number (9756837909).

Almost surely, 2^64381855105 is an apocalyptic number.

It is an amenable number.

64381855105 is a deficient number, since it is larger than the sum of its proper divisors (13672848167).

64381855105 is a wasteful number, since it uses less digits than its factorization.

64381855105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132746195.

The product of its (nonzero) digits is 576000, while the sum is 46.

The spelling of 64381855105 in words is "sixty-four billion, three hundred eighty-one million, eight hundred fifty-five thousand, one hundred five".