840221556496 has 135 divisors (see below), whose sum is σ = 1999789161831. Its totient is φ = 340944593472.

The previous prime is 840221556469. The next prime is 840221556511. The reversal of 840221556496 is 694655122048.

The square root of 840221556496 is 916636.

It is a perfect power (a square), and thus also a powerful number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 487649491 + ... + 487651213.

Almost surely, 2^840221556496 is an apocalyptic number.

840221556496 is the 916636-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840221556496

840221556496 is an abundant number, since it is smaller than the sum of its proper divisors (1159567605335).

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

840221556496 is an equidigital number, since it uses as much as digits as its factorization.

840221556496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3506 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 840221556496 in words is "eight hundred forty billion, two hundred twenty-one million, five hundred fifty-six thousand, four hundred ninety-six".