651545856 has 180 divisors, whose sum is σ = 2093103012. Its totient is φ = 200392704.

The previous prime is 651545837. The next prime is 651545857. The reversal of 651545856 is 658545156.

651545856 is a `hidden beast` number, since 6 + 51 + 545 + 8 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 400640256 + 250905600 = 20016^2 + 15840^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651545857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 268360 + ... + 270776.

Almost surely, 2^651545856 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 651545856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1046551506).

651545856 is an abundant number, since it is smaller than the sum of its proper divisors (1441557156).

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

651545856 is a wasteful number, since it uses less digits than its factorization.

651545856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458 (or 2435 counting only the distinct ones).

The product of its digits is 720000, while the sum is 45.

The square root of 651545856 is about 25525.3962946709. The cubic root of 651545856 is about 866.9252698367.

The spelling of 651545856 in words is "six hundred fifty-one million, five hundred forty-five thousand, eight hundred fifty-six".