64128461805 has 48 divisors (see below), whose sum is σ = 115332060480. Its totient is φ = 34184291328.

The previous prime is 64128461791. The next prime is 64128461809. The reversal of 64128461805 is 50816482146.

It is a happy number.

64128461805 is a `hidden beast` number, since 6 + 4 + 1 + 28 + 4 + 618 + 0 + 5 = 666.

It is not a de Polignac number, because 64128461805 - 2⁵ = 64128461773 is a prime.

It is a super-2 number, since 2×64128461805² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64128461809) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2554806 + ... + 2579784.

It is an arithmetic number, because the mean of its divisors is an integer number (2402751260).

Almost surely, 2^64128461805 is an apocalyptic number.

It is an amenable number.

64128461805 is a deficient number, since it is larger than the sum of its proper divisors (51203598675).

64128461805 is a wasteful number, since it uses less digits than its factorization.

64128461805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27112 (or 27100 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 64128461805 in words is "sixty-four billion, one hundred twenty-eight million, four hundred sixty-one thousand, eight hundred five".