51326661643641 has 16 divisors (see below), whose sum is σ = 76039613622720. Its totient is φ = 34217722728000.

The previous prime is 51326661643637. The next prime is 51326661643681. The reversal of 51326661643641 is 14634616662315.

It is a happy number.

It is not a de Polignac number, because 51326661643641 - 2² = 51326661643637 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51326661643681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27005761 + ... + 28843793.

It is an arithmetic number, because the mean of its divisors is an integer number (4752475851420).

Almost surely, 2^{51326661643641} is an apocalyptic number.

It is an amenable number.

51326661643641 is a deficient number, since it is larger than the sum of its proper divisors (24712951979079).

51326661643641 is a wasteful number, since it uses less digits than its factorization.

51326661643641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2872293 (or 2872287 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 54.

The spelling of 51326661643641 in words is "fifty-one trillion, three hundred twenty-six billion, six hundred sixty-one million, six hundred forty-three thousand, six hundred forty-one".