51487355808 has 480 divisors, whose sum is σ = 183230087040. Its totient is φ = 13854965760.

The previous prime is 51487355807. The next prime is 51487355839. The reversal of 51487355808 is 80855378415.

51487355808 is a `hidden beast` number, since 5 + 1 + 4 + 87 + 3 + 558 + 0 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (51487355807) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 80323168 + ... + 80323808.

It is an arithmetic number, because the mean of its divisors is an integer number (381729348).

Almost surely, 2^51487355808 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 51487355808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91615043520).

51487355808 is an abundant number, since it is smaller than the sum of its proper divisors (131742731232).

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

51487355808 is a wasteful number, since it uses less digits than its factorization.

51487355808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 905 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 54.

The spelling of 51487355808 in words is "fifty-one billion, four hundred eighty-seven million, three hundred fifty-five thousand, eight hundred eight".