64136728265 has 8 divisors (see below), whose sum is σ = 77389290888. Its totient is φ = 51025904640.

The previous prime is 64136728261. The next prime is 64136728363. The reversal of 64136728265 is 56282763146.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 261242569 + 63875485696 = 16163^2 + 252736^2 .

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

It is not a de Polignac number, because 64136728265 - 2² = 64136728261 is a prime.

It is a super-2 number, since 2×64136728265² (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 (64136728261) 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, 35433752 + ... + 35435561.

It is an arithmetic number, because the mean of its divisors is an integer number (9673661361).

Almost surely, 2^64136728265 is an apocalyptic number.

It is an amenable number.

64136728265 is a deficient number, since it is larger than the sum of its proper divisors (13252562623).

64136728265 is a wasteful number, since it uses less digits than its factorization.

64136728265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70869499.

The product of its digits is 2903040, while the sum is 50.

The spelling of 64136728265 in words is "sixty-four billion, one hundred thirty-six million, seven hundred twenty-eight thousand, two hundred sixty-five".