221751161256 has 32 divisors (see below), whose sum is σ = 554826140640. Its totient is φ = 73857288768.

The previous prime is 221751161249. The next prime is 221751161309. The reversal of 221751161256 is 652161157122.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3705006 + ... + 3764381.

It is an arithmetic number, because the mean of its divisors is an integer number (17338316895).

Almost surely, 2^221751161256 is an apocalyptic number.

It is an amenable number.

221751161256 is an abundant number, since it is smaller than the sum of its proper divisors (333074979384).

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

221751161256 is a wasteful number, since it uses less digits than its factorization.

221751161256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7470633 (or 7470629 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The spelling of 221751161256 in words is "two hundred twenty-one billion, seven hundred fifty-one million, one hundred sixty-one thousand, two hundred fifty-six".