51802209664 has 64 divisors (see below), whose sum is σ = 104765734080. Its totient is φ = 25510003200.

The previous prime is 51802209659. The next prime is 51802209671. The reversal of 51802209664 is 46690220815.

51802209664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 51802209664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3509179 + ... + 3523909.

It is an arithmetic number, because the mean of its divisors is an integer number (1636964595).

Almost surely, 2^51802209664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51802209664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52382867040).

51802209664 is an abundant number, since it is smaller than the sum of its proper divisors (52963524416).

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

51802209664 is a wasteful number, since it uses less digits than its factorization.

51802209664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15159 (or 15147 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 51802209664 in words is "fifty-one billion, eight hundred two million, two hundred nine thousand, six hundred sixty-four".