1665617222 has 4 divisors (see below), whose sum is σ = 2498425836. Its totient is φ = 832808610.

The previous prime is 1665617209. The next prime is 1665617227. The reversal of 1665617222 is 2227165661.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665617227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 416404304 + ... + 416404307.

It is an arithmetic number, because the mean of its divisors is an integer number (624606459).

Almost surely, 2^1665617222 is an apocalyptic number.

1665617222 is a deficient number, since it is larger than the sum of its proper divisors (832808614).

1665617222 is an equidigital number, since it uses as much as digits as its factorization.

1665617222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832808613.

The product of its digits is 60480, while the sum is 38.

The square root of 1665617222 is about 40811.9740027360. The cubic root of 1665617222 is about 1185.3821984001.

The spelling of 1665617222 in words is "one billion, six hundred sixty-five million, six hundred seventeen thousand, two hundred twenty-two".