64633600026641 has 4 divisors (see below), whose sum is σ = 64635348193332. Its totient is φ = 64631851859952.

The previous prime is 64633600026623. The next prime is 64633600026661. The reversal of 64633600026641 is 14662000633646.

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 29481685527616 + 35151914499025 = 5429704^2 + 5928905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64633600026641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64633600026661) 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, 874027886 + ... + 874101831.

It is an arithmetic number, because the mean of its divisors is an integer number (16158837048333).

Almost surely, 2^{64633600026641} is an apocalyptic number.

It is an amenable number.

64633600026641 is a deficient number, since it is larger than the sum of its proper divisors (1748166691).

64633600026641 is a wasteful number, since it uses less digits than its factorization.

64633600026641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1748166690.

The product of its (nonzero) digits is 2239488, while the sum is 47.

The spelling of 64633600026641 in words is "sixty-four trillion, six hundred thirty-three billion, six hundred million, twenty-six thousand, six hundred forty-one".