556781857320 has 1024 divisors, whose sum is σ = 2116316160000. Its totient is φ = 115539443712.

The previous prime is 556781857309. The next prime is 556781857321. The reversal of 556781857320 is 23758187655.

556781857320 = T₉₁ + T₉₂ + ... + T₁₄₉₄₈.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (556781857321) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 1240048456 + ... + 1240048904.

It is an arithmetic number, because the mean of its divisors is an integer number (2066715000).

Almost surely, 2^556781857320 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 556781857320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058158080000).

556781857320 is an abundant number, since it is smaller than the sum of its proper divisors (1559534302680).

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

556781857320 is a wasteful number, since it uses less digits than its factorization.

556781857320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 14112000, while the sum is 57.

The spelling of 556781857320 in words is "five hundred fifty-six billion, seven hundred eighty-one million, eight hundred fifty-seven thousand, three hundred twenty".