51815783040 has 192 divisors, whose sum is σ = 192128513760. Its totient is φ = 11843586048.

The previous prime is 51815783027. The next prime is 51815783077. The reversal of 51815783040 is 4038751815.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 51815782983 and 51815783001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181302 + ... + 369461.

Almost surely, 2^51815783040 is an apocalyptic number.

It is an amenable number.

51815783040 is an abundant number, since it is smaller than the sum of its proper divisors (140312730720).

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

51815783040 is a wasteful number, since it uses less digits than its factorization.

51815783040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550799 (or 550780 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 51815783040 in words is "fifty-one billion, eight hundred fifteen million, seven hundred eighty-three thousand, forty".