51155305340 has 192 divisors, whose sum is σ = 117272752128. Its totient is φ = 18703872000.

The previous prime is 51155305339. The next prime is 51155305361. The reversal of 51155305340 is 4350355115.

It is a junction number, because it is equal to n+sod(n) for n = 51155305297 and 51155305306.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 127569140 + ... + 127569540.

It is an arithmetic number, because the mean of its divisors is an integer number (610795584).

Almost surely, 2^51155305340 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 51155305340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58636376064).

51155305340 is an abundant number, since it is smaller than the sum of its proper divisors (66117446788).

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

51155305340 is a wasteful number, since it uses less digits than its factorization.

51155305340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 32.

The spelling of 51155305340 in words is "fifty-one billion, one hundred fifty-five million, three hundred five thousand, three hundred forty".