51783737808 has 320 divisors, whose sum is σ = 158218444800. Its totient is φ = 14420090880.

The previous prime is 51783737779. The next prime is 51783737813. The reversal of 51783737808 is 80873738715.

It is a happy number.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 73037358 + ... + 73038066.

It is an arithmetic number, because the mean of its divisors is an integer number (494432640).

Almost surely, 2^51783737808 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 51783737808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79109222400).

51783737808 is an abundant number, since it is smaller than the sum of its proper divisors (106434706992).

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

51783737808 is a wasteful number, since it uses less digits than its factorization.

51783737808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930 (or 924 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 57.

The spelling of 51783737808 in words is "fifty-one billion, seven hundred eighty-three million, seven hundred thirty-seven thousand, eight hundred eight".