221256766391676 has 24 divisors (see below), whose sum is σ = 517728297572304. Its totient is φ = 73543325560320.

The previous prime is 221256766391669. The next prime is 221256766391701. The reversal of 221256766391676 is 676193667652122.

It is a self number, because there is not a number n which added to its sum of digits gives 221256766391676.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26116233535 + ... + 26116242006.

It is an arithmetic number, because the mean of its divisors is an integer number (21572012398846).

Almost surely, 2^{221256766391676} is an apocalyptic number.

It is an amenable number.

221256766391676 is an abundant number, since it is smaller than the sum of its proper divisors (296471531180628).

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

221256766391676 is a wasteful number, since it uses less digits than its factorization.

221256766391676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52232475901 (or 52232475899 counting only the distinct ones).

The product of its digits is 411505920, while the sum is 69.

The spelling of 221256766391676 in words is "two hundred twenty-one trillion, two hundred fifty-six billion, seven hundred sixty-six million, three hundred ninety-one thousand, six hundred seventy-six".