22665913 has 4 divisors (see below), whose sum is σ = 23999220. Its totient is φ = 21332608.

The previous prime is 22665911. The next prime is 22665919. The reversal of 22665913 is 31956622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31956622 = 2 ⋅15978311.

It can be written as a sum of positive squares in 2 ways, for example, as 16867449 + 5798464 = 4107^2 + 2408^2 .

It is a cyclic number.

It is not a de Polignac number, because 22665913 - 2¹ = 22665911 is a prime.

It is a super-2 number, since 2×22665913² = 1027487224247138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22665911) 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, 666628 + ... + 666661.

It is an arithmetic number, because the mean of its divisors is an integer number (5999805).

Almost surely, 2^22665913 is an apocalyptic number.

It is an amenable number.

22665913 is a deficient number, since it is larger than the sum of its proper divisors (1333307).

22665913 is a wasteful number, since it uses less digits than its factorization.

22665913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1333306.

The product of its digits is 19440, while the sum is 34.

The square root of 22665913 is about 4760.8731342055. The cubic root of 22665913 is about 283.0030216062.

The spelling of 22665913 in words is "twenty-two million, six hundred sixty-five thousand, nine hundred thirteen".