51056105640 has 128 divisors (see below), whose sum is σ = 163228815360. Its totient is φ = 12745889024.

The previous prime is 51056105621. The next prime is 51056105641. The reversal of 51056105640 is 4650165015.

51056105640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (51056105641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67074 + ... + 326513.

It is an arithmetic number, because the mean of its divisors is an integer number (1275225120).

Almost surely, 2^51056105640 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 51056105640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81614407680).

51056105640 is an abundant number, since it is smaller than the sum of its proper divisors (112172709720).

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

51056105640 is a wasteful number, since it uses less digits than its factorization.

51056105640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393671 (or 393667 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 33.

The spelling of 51056105640 in words is "fifty-one billion, fifty-six million, one hundred five thousand, six hundred forty".