222506661 has 8 divisors (see below), whose sum is σ = 319496800. Its totient is φ = 136927152.

The previous prime is 222506629. The next prime is 222506671. The reversal of 222506661 is 166605222.

222506661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 222506661 - 2⁵ = 222506629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222506671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2852611 + ... + 2852688.

It is an arithmetic number, because the mean of its divisors is an integer number (39937100).

Almost surely, 2^222506661 is an apocalyptic number.

It is an amenable number.

222506661 is a deficient number, since it is larger than the sum of its proper divisors (96990139).

222506661 is a wasteful number, since it uses less digits than its factorization.

222506661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5705315.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 222506661 is about 14916.6571657325. The cubic root of 222506661 is about 605.9651838748.

The spelling of 222506661 in words is "two hundred twenty-two million, five hundred six thousand, six hundred sixty-one".