64941329635813 has 4 divisors (see below), whose sum is σ = 64941350853708. Its totient is φ = 64941308417920.

The previous prime is 64941329635811. The next prime is 64941329635907. The reversal of 64941329635813 is 31853692314946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40312759688289 + 24628569947524 = 6349233^2 + 4962718^2 .

It is a cyclic number.

It is not a de Polignac number, because 64941329635813 - 2¹ = 64941329635811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64941329635811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5045356 + ... + 12463477.

It is an arithmetic number, because the mean of its divisors is an integer number (16235337713427).

Almost surely, 2^{64941329635813} is an apocalyptic number.

It is an amenable number.

64941329635813 is a deficient number, since it is larger than the sum of its proper divisors (21217895).

64941329635813 is a wasteful number, since it uses less digits than its factorization.

64941329635813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21217894.

The product of its digits is 100776960, while the sum is 64.

The spelling of 64941329635813 in words is "sixty-four trillion, nine hundred forty-one billion, three hundred twenty-nine million, six hundred thirty-five thousand, eight hundred thirteen".