221777724474466 has 8 divisors (see below), whose sum is σ = 352235209459500. Its totient is φ = 104365987987968.

The previous prime is 221777724474443. The next prime is 221777724474469. The reversal of 221777724474466 is 664474427777122.

It can be written as a sum of positive squares in 2 ways, for example, as 215239091918841 + 6538632555625 = 14671029^2 + 2557075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 221777724474395 and 221777724474404.

It is not an unprimeable number, because it can be changed into a prime (221777724474469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3261437124591 + ... + 3261437124658.

Almost surely, 2^{221777724474466} is an apocalyptic number.

221777724474466 is a deficient number, since it is larger than the sum of its proper divisors (130457484985034).

221777724474466 is a wasteful number, since it uses less digits than its factorization.

221777724474466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6522874249268.

The product of its digits is 1239146496, while the sum is 70.

The spelling of 221777724474466 in words is "two hundred twenty-one trillion, seven hundred seventy-seven billion, seven hundred twenty-four million, four hundred seventy-four thousand, four hundred sixty-six".