64072726181 has 8 divisors (see below), whose sum is σ = 67846010904. Its totient is φ = 60299919360.

The previous prime is 64072726177. The next prime is 64072726183. The reversal of 64072726181 is 18162727046.

64072726181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 16535645281 + 47537080900 = 128591^2 + 218030^2 .

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

It is not a de Polignac number, because 64072726181 - 2² = 64072726177 is a prime.

It is a super-2 number, since 2×64072726181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64072726183) 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, 177701 + ... + 399653.

It is an arithmetic number, because the mean of its divisors is an integer number (8480751363).

Almost surely, 2^64072726181 is an apocalyptic number.

It is an amenable number.

64072726181 is a deficient number, since it is larger than the sum of its proper divisors (3773284723).

64072726181 is a wasteful number, since it uses less digits than its factorization.

64072726181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238951.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 64072726181 in words is "sixty-four billion, seventy-two million, seven hundred twenty-six thousand, one hundred eighty-one".