51406247040 has 128 divisors (see below), whose sum is σ = 163926892800. Its totient is φ = 13702520832.

The previous prime is 51406247033. The next prime is 51406247047. The reversal of 51406247040 is 4074260415.

It is an interprime number because it is at equal distance from previous prime (51406247033) and next prime (51406247047).

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 51406246992 and 51406247010.

It is not an unprimeable number, because it can be changed into a prime (51406247047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6414556 + ... + 6422564.

It is an arithmetic number, because the mean of its divisors is an integer number (1280678850).

Almost surely, 2^51406247040 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 51406247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81963446400).

51406247040 is an abundant number, since it is smaller than the sum of its proper divisors (112520645760).

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

51406247040 is a wasteful number, since it uses less digits than its factorization.

51406247040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374 (or 11362 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The spelling of 51406247040 in words is "fifty-one billion, four hundred six million, two hundred forty-seven thousand, forty".