51395783040 has 448 divisors, whose sum is σ = 210548000160. Its totient is φ = 11746861056.

The previous prime is 51395783027. The next prime is 51395783051. The reversal of 51395783040 is 4038759315.

51395783040 is a `hidden beast` number, since 5 + 1 + 3 + 9 + 578 + 30 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 3258052 + ... + 3273788.

Almost surely, 2^51395783040 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 51395783040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105274000080).

51395783040 is an abundant number, since it is smaller than the sum of its proper divisors (159152217120).

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

51395783040 is an equidigital number, since it uses as much as digits as its factorization.

51395783040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15781 (or 15754 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 51395783040 in words is "fifty-one billion, three hundred ninety-five million, seven hundred eighty-three thousand, forty".