51831299520 has 1344 divisors, whose sum is σ = 247388359680. Its totient is φ = 9920102400.

The previous prime is 51831299479. The next prime is 51831299573. The reversal of 51831299520 is 2599213815.

51831299520 is a `hidden beast` number, since 5 + 1 + 8 + 31 + 2 + 99 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (1344).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 112432090 + ... + 112432550.

It is an arithmetic number, because the mean of its divisors is an integer number (184068720).

Almost surely, 2^51831299520 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 51831299520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123694179840).

51831299520 is an abundant number, since it is smaller than the sum of its proper divisors (195557060160).

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

51831299520 is a wasteful number, since it uses less digits than its factorization.

51831299520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 502 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 51831299520 in words is "fifty-one billion, eight hundred thirty-one million, two hundred ninety-nine thousand, five hundred twenty".