51291383808 has 576 divisors, whose sum is σ = 173323463040. Its totient is φ = 13164871680.

The previous prime is 51291383729. The next prime is 51291383821. The reversal of 51291383808 is 80838319215.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 702621660 + ... + 702621732.

It is an arithmetic number, because the mean of its divisors is an integer number (300908790).

Almost surely, 2^51291383808 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 51291383808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86661731520).

51291383808 is an abundant number, since it is smaller than the sum of its proper divisors (122032079232).

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

51291383808 is a wasteful number, since it uses less digits than its factorization.

51291383808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 51291383808 in words is "fifty-one billion, two hundred ninety-one million, three hundred eighty-three thousand, eight hundred eight".