51645734140 has 144 divisors (see below), whose sum is σ = 146420144640. Its totient is φ = 14859037440.

The previous prime is 51645734099. The next prime is 51645734143. The reversal of 51645734140 is 4143754615.

51645734140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51645734093 and 51645734102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645734143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161041 + ... + 359479.

It is an arithmetic number, because the mean of its divisors is an integer number (1016806560).

Almost surely, 2^51645734140 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 51645734140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73210072320).

51645734140 is an abundant number, since it is smaller than the sum of its proper divisors (94774410500).

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

51645734140 is a wasteful number, since it uses less digits than its factorization.

51645734140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198492 (or 198477 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 51645734140 in words is "fifty-one billion, six hundred forty-five million, seven hundred thirty-four thousand, one hundred forty".