51247595520 has 720 divisors, whose sum is σ = 198741029760. Its totient is φ = 12111052800.

The previous prime is 51247595507. The next prime is 51247595557. The reversal of 51247595520 is 2559574215.

51247595520 is a `hidden beast` number, since 5 + 1 + 2 + 4 + 7 + 595 + 52 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (720).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 575815636 + ... + 575815724.

It is an arithmetic number, because the mean of its divisors is an integer number (276029208).

Almost surely, 2^51247595520 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 51247595520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99370514880).

51247595520 is an abundant number, since it is smaller than the sum of its proper divisors (147493434240).

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

51247595520 is a wasteful number, since it uses less digits than its factorization.

51247595520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 51247595520 in words is "fifty-one billion, two hundred forty-seven million, five hundred ninety-five thousand, five hundred twenty".