51855043968 has 1280 divisors, whose sum is σ = 208257920640. Its totient is φ = 12421693440.

The previous prime is 51855043939. The next prime is 51855043969. The reversal of 51855043968 is 86934055815.

51855043968 is a `hidden beast` number, since 51 + 8 + 550 + 4 + 39 + 6 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855043969) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 850082658 + ... + 850082718.

Almost surely, 2^51855043968 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 51855043968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104128960320).

51855043968 is an abundant number, since it is smaller than the sum of its proper divisors (156402876672).

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

51855043968 is a wasteful number, since it uses less digits than its factorization.

51855043968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 54.

The spelling of 51855043968 in words is "fifty-one billion, eight hundred fifty-five million, forty-three thousand, nine hundred sixty-eight".