22166537 has 4 divisors (see below), whose sum is σ = 22395156. Its totient is φ = 21937920.

The previous prime is 22166509. The next prime is 22166539. The reversal of 22166537 is 73566122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13808656 + 8357881 = 3716^2 + 2891^2 .

It is a cyclic number.

It is not a de Polignac number, because 22166537 - 2¹⁰ = 22165513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22166539) 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, 114164 + ... + 114357.

It is an arithmetic number, because the mean of its divisors is an integer number (5598789).

Almost surely, 2^22166537 is an apocalyptic number.

It is an amenable number.

22166537 is a deficient number, since it is larger than the sum of its proper divisors (228619).

22166537 is an equidigital number, since it uses as much as digits as its factorization.

22166537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228618.

The product of its digits is 15120, while the sum is 32.

The square root of 22166537 is about 4708.1351934710. The cubic root of 22166537 is about 280.9091916653.

The spelling of 22166537 in words is "twenty-two million, one hundred sixty-six thousand, five hundred thirty-seven".