22155516 has 18 divisors (see below), whose sum is σ = 56004312. Its totient is φ = 7385160.

The previous prime is 22155491. The next prime is 22155547. The reversal of 22155516 is 61555122.

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 22155516.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307680 + ... + 307751.

Almost surely, 2^22155516 is an apocalyptic number.

It is an amenable number.

22155516 is an abundant number, since it is smaller than the sum of its proper divisors (33848796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22155516 is a wasteful number, since it uses less digits than its factorization.

22155516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615441 (or 615436 counting only the distinct ones).

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

The square root of 22155516 is about 4706.9646270181. The cubic root of 22155516 is about 280.8626287849.

The spelling of 22155516 in words is "twenty-two million, one hundred fifty-five thousand, five hundred sixteen".