64563874371613 has 4 divisors (see below), whose sum is σ = 64975109240380. Its totient is φ = 64152639502848.

The previous prime is 64563874371611. The next prime is 64563874371707. The reversal of 64563874371613 is 31617347836546.

It is a happy number.

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 10275595680249 + 54288278691364 = 3205557^2 + 7368058^2 .

It is a cyclic number.

It is not a de Polignac number, because 64563874371613 - 2¹ = 64563874371611 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 (64563874371611) 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, 205617434148 + ... + 205617434461.

It is an arithmetic number, because the mean of its divisors is an integer number (16243777310095).

Almost surely, 2^{64563874371613} is an apocalyptic number.

It is an amenable number.

64563874371613 is a deficient number, since it is larger than the sum of its proper divisors (411234868767).

64563874371613 is a wasteful number, since it uses less digits than its factorization.

64563874371613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411234868766.

The product of its digits is 182891520, while the sum is 64.

The spelling of 64563874371613 in words is "sixty-four trillion, five hundred sixty-three billion, eight hundred seventy-four million, three hundred seventy-one thousand, six hundred thirteen".