51987567744 has 896 divisors, whose sum is σ = 192647808000. Its totient is φ = 13638481920.

The previous prime is 51987567719. The next prime is 51987567769. The reversal of 51987567744 is 44776578915.

51987567744 is a `hidden beast` number, since 519 + 8 + 7 + 5 + 6 + 77 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (51987567719) and next prime (51987567769).

It is a tau number, because it is divible by the number of its divisors (896).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 732219229 + ... + 732219299.

Almost surely, 2^51987567744 is an apocalyptic number.

51987567744 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51987567744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96323904000).

51987567744 is an abundant number, since it is smaller than the sum of its proper divisors (140660240256).

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

51987567744 is an equidigital number, since it uses as much as digits as its factorization.

51987567744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188 (or 161 counting only the distinct ones).

The product of its digits is 59270400, while the sum is 63.

The spelling of 51987567744 in words is "fifty-one billion, nine hundred eighty-seven million, five hundred sixty-seven thousand, seven hundred forty-four".