51318299501280 has 864 divisors, whose sum is σ = 205612412765760. Its totient is φ = 11621171036160.

The previous prime is 51318299501251. The next prime is 51318299501281. The reversal of 51318299501280 is 8210599281315.

51318299501280 is a `hidden beast` number, since 5 + 1 + 31 + 8 + 29 + 9 + 501 + 2 + 80 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51318299501281) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 3349969461 + ... + 3349984779.

It is an arithmetic number, because the mean of its divisors is an integer number (237977329590).

Almost surely, 2^{51318299501280} 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 51318299501280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102806206382880).

51318299501280 is an abundant number, since it is smaller than the sum of its proper divisors (154294113264480).

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

51318299501280 is a wasteful number, since it uses less digits than its factorization.

51318299501280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15792 (or 15774 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 51318299501280 in words is "fifty-one trillion, three hundred eighteen billion, two hundred ninety-nine million, five hundred one thousand, two hundred eighty".