51545173680 has 1440 divisors, whose sum is σ = 250905066048. Its totient is φ = 9289728000.

The previous prime is 51545173679. The next prime is 51545173699. The reversal of 51545173680 is 8637154515.

51545173680 is a `hidden beast` number, since 5 + 1 + 54 + 517 + 3 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 85765380 + ... + 85765980.

Almost surely, 2^51545173680 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 51545173680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125452533024).

51545173680 is an abundant number, since it is smaller than the sum of its proper divisors (199359892368).

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

51545173680 is a wasteful number, since it uses less digits than its factorization.

51545173680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 504000, while the sum is 45.

The spelling of 51545173680 in words is "fifty-one billion, five hundred forty-five million, one hundred seventy-three thousand, six hundred eighty".