64136806068 has 96 divisors (see below), whose sum is σ = 162892800000. Its totient is φ = 19566368640.

The previous prime is 64136806061. The next prime is 64136806091. The reversal of 64136806068 is 86060863146.

It is a super-2 number, since 2×64136806068² (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 (64136806061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4226158 + ... + 4241306.

It is an arithmetic number, because the mean of its divisors is an integer number (1696800000).

Almost surely, 2^64136806068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64136806068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81446400000).

64136806068 is an abundant number, since it is smaller than the sum of its proper divisors (98755993932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64136806068 is a wasteful number, since it uses less digits than its factorization.

64136806068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15805 (or 15803 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 48.

The spelling of 64136806068 in words is "sixty-four billion, one hundred thirty-six million, eight hundred six thousand, sixty-eight".