51291159552 has 440 divisors, whose sum is σ = 159680836656. Its totient is φ = 16387080192.

The previous prime is 51291159551. The next prime is 51291159553. The reversal of 51291159552 is 25595119215.

51291159552 is a `hidden beast` number, since 5 + 1 + 2 + 9 + 1 + 1 + 595 + 52 = 666.

It is an interprime number because it is at equal distance from previous prime (51291159551) and next prime (51291159553).

It is a junction number, because it is equal to n+sod(n) for n = 51291159498 and 51291159507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51291159551) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 260361118 + ... + 260361314.

Almost surely, 2^51291159552 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 51291159552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79840418328).

51291159552 is an abundant number, since it is smaller than the sum of its proper divisors (108389677104).

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

51291159552 is a wasteful number, since it uses less digits than its factorization.

51291159552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 318 counting only the distinct ones).

The product of its digits is 202500, while the sum is 45.

The spelling of 51291159552 in words is "fifty-one billion, two hundred ninety-one million, one hundred fifty-nine thousand, five hundred fifty-two".