22718665 has 8 divisors (see below), whose sum is σ = 27380808. Its totient is φ = 18096000.

The previous prime is 22718659. The next prime is 22718669. The reversal of 22718665 is 56681722.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 741321 + 21977344 = 861^2 + 4688^2 .

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

It is not a de Polignac number, because 22718665 - 2⁹ = 22718153 is a prime.

It is a super-2 number, since 2×22718665² = 1032275478764450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22718669) 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, 8586 + ... + 10915.

It is an arithmetic number, because the mean of its divisors is an integer number (3422601).

Almost surely, 2^22718665 is an apocalyptic number.

It is an amenable number.

22718665 is a deficient number, since it is larger than the sum of its proper divisors (4662143).

22718665 is a wasteful number, since it uses less digits than its factorization.

22718665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19739.

The product of its digits is 40320, while the sum is 37.

The square root of 22718665 is about 4766.4100746788. The cubic root of 22718665 is about 283.2224025563. Note that the first 3 decimals are identical.

The spelling of 22718665 in words is "twenty-two million, seven hundred eighteen thousand, six hundred sixty-five".