51369655680 has 1024 divisors, whose sum is σ = 216794880000. Its totient is φ = 11631900672.

The previous prime is 51369655669. The next prime is 51369655703. The reversal of 51369655680 is 8655696315.

It is a happy number.

51369655680 is a `hidden beast` number, since 5 + 1 + 3 + 6 + 9 + 6 + 556 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 480090187 + ... + 480090293.

It is an arithmetic number, because the mean of its divisors is an integer number (211713750).

Almost surely, 2^51369655680 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 51369655680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108397440000).

51369655680 is an abundant number, since it is smaller than the sum of its proper divisors (165425224320).

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

51369655680 is an frugal number, since it uses more digits than its factorization.

51369655680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 54.

The spelling of 51369655680 in words is "fifty-one billion, three hundred sixty-nine million, six hundred fifty-five thousand, six hundred eighty".