81669122 has 16 divisors (see below), whose sum is σ = 130905720. Its totient is φ = 38078208.

The previous prime is 81669121. The next prime is 81669149. The reversal of 81669122 is 22196618.

It can be written as a sum of positive squares in 4 ways, for example, as 71048041 + 10621081 = 8429^2 + 3259^2 .

It is a super-3 number, since 3×81669122³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81669121) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7313 + ... + 14724.

Almost surely, 2^81669122 is an apocalyptic number.

81669122 is a deficient number, since it is larger than the sum of its proper divisors (49236598).

81669122 is a wasteful number, since it uses less digits than its factorization.

81669122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22165.

The product of its digits is 10368, while the sum is 35.

The square root of 81669122 is about 9037.0969896311. The cubic root of 81669122 is about 433.8630139564.

The spelling of 81669122 in words is "eighty-one million, six hundred sixty-nine thousand, one hundred twenty-two".