22165551 has 6 divisors (see below), whose sum is σ = 32016920. Its totient is φ = 14777028.

The previous prime is 22165547. The next prime is 22165579. The reversal of 22165551 is 15556122.

22165551 is a `hidden beast` number, since 2 + 2 + 1 + 655 + 5 + 1 = 666.

It is not a de Polignac number, because 22165551 - 2² = 22165547 is a prime.

It is a super-2 number, since 2×22165551² = 982623302267202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22165151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1231411 + ... + 1231428.

Almost surely, 2^22165551 is an apocalyptic number.

22165551 is a deficient number, since it is larger than the sum of its proper divisors (9851369).

22165551 is a wasteful number, since it uses less digits than its factorization.

22165551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462845 (or 2462842 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 22165551 is about 4708.0304799353. The cubic root of 22165551 is about 280.9050265195.

The spelling of 22165551 in words is "twenty-two million, one hundred sixty-five thousand, five hundred fifty-one".