212485665 has 32 divisors (see below), whose sum is σ = 390286080. Its totient is φ = 96701184.

The previous prime is 212485649. The next prime is 212485667. The reversal of 212485665 is 566584212.

It is not a de Polignac number, because 212485665 - 2⁴ = 212485649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212485667) 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 31 ways as a sum of consecutive naturals, for example, 19627 + ... + 28463.

It is an arithmetic number, because the mean of its divisors is an integer number (12196440).

Almost surely, 2^212485665 is an apocalyptic number.

It is an amenable number.

212485665 is a deficient number, since it is larger than the sum of its proper divisors (177800415).

212485665 is a wasteful number, since it uses less digits than its factorization.

212485665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9081.

The product of its digits is 115200, while the sum is 39.

The square root of 212485665 is about 14576.8880423772. Note that the first 3 decimals coincide. The cubic root of 212485665 is about 596.7281771666.

The spelling of 212485665 in words is "two hundred twelve million, four hundred eighty-five thousand, six hundred sixty-five".