51665641544 has 64 divisors (see below), whose sum is σ = 106241889600. Its totient is φ = 23359795200.

The previous prime is 51665641537. The next prime is 51665641561. The reversal of 51665641544 is 44514656615.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15370424 + ... + 15373784.

It is an arithmetic number, because the mean of its divisors is an integer number (1660029525).

Almost surely, 2^51665641544 is an apocalyptic number.

It is an amenable number.

51665641544 is an abundant number, since it is smaller than the sum of its proper divisors (54576248056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51665641544 is a wasteful number, since it uses less digits than its factorization.

51665641544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254 (or 4250 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 47.

The spelling of 51665641544 in words is "fifty-one billion, six hundred sixty-five million, six hundred forty-one thousand, five hundred forty-four".