51021543456 has 108 divisors (see below), whose sum is σ = 157112162298. Its totient is φ = 15698921472.

The previous prime is 51021543451. The next prime is 51021543481. The reversal of 51021543456 is 65434512015.

51021543456 is a `hidden beast` number, since 5 + 1 + 0 + 215 + 434 + 5 + 6 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 17281731600 + 33739811856 = 131460^2 + 183684^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51021543456.

It is not an unprimeable number, because it can be changed into a prime (51021543451) 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 17 ways as a sum of consecutive naturals, for example, 475465 + ... + 572808.

Almost surely, 2^51021543456 is an apocalyptic number.

It is an amenable number.

51021543456 is an abundant number, since it is smaller than the sum of its proper divisors (106090618842).

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

51021543456 is a wasteful number, since it uses less digits than its factorization.

51021543456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048315 (or 1048291 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

It can be divided in two parts, 5102154 and 3456, that added together give a triangular number (5105610 = T₃₁₉₅).

The spelling of 51021543456 in words is "fifty-one billion, twenty-one million, five hundred forty-three thousand, four hundred fifty-six".