22155566 has 8 divisors (see below), whose sum is σ = 33778344. Its totient is φ = 10896120.

The previous prime is 22155559. The next prime is 22155569. The reversal of 22155566 is 66555122.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22155569) 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, 90680 + ... + 90923.

It is an arithmetic number, because the mean of its divisors is an integer number (4222293).

Almost surely, 2^22155566 is an apocalyptic number.

22155566 is a deficient number, since it is larger than the sum of its proper divisors (11622778).

22155566 is a wasteful number, since it uses less digits than its factorization.

22155566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181666.

The product of its digits is 18000, while the sum is 32.

The square root of 22155566 is about 4706.9699382936. The cubic root of 22155566 is about 280.8628400660.

The spelling of 22155566 in words is "twenty-two million, one hundred fifty-five thousand, five hundred sixty-six".