51491471526 has 128 divisors (see below), whose sum is σ = 128037127680. Its totient is φ = 15204067200.

The previous prime is 51491471501. The next prime is 51491471527. The reversal of 51491471526 is 62517419415.

51491471526 is a `hidden beast` number, since 5 + 1 + 49 + 14 + 71 + 526 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51491471527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11772676 + ... + 11777048.

It is an arithmetic number, because the mean of its divisors is an integer number (1000290060).

Almost surely, 2^51491471526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51491471526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64018563840).

51491471526 is an abundant number, since it is smaller than the sum of its proper divisors (76545656154).

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

51491471526 is a wasteful number, since it uses less digits than its factorization.

51491471526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4899 (or 4893 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 51491471526 in words is "fifty-one billion, four hundred ninety-one million, four hundred seventy-one thousand, five hundred twenty-six".