212925616165 has 16 divisors (see below), whose sum is σ = 273329873712. Its totient is φ = 158667669504.

The previous prime is 212925616159. The next prime is 212925616177. The reversal of 212925616165 is 561616529212.

It can be written as a sum of positive squares in 8 ways, for example, as 11660328289 + 201265287876 = 107983^2 + 448626^2 .

It is a cyclic number.

It is not a de Polignac number, because 212925616165 - 2⁷ = 212925616037 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12904164 + ... + 12920653.

It is an arithmetic number, because the mean of its divisors is an integer number (17083117107).

Almost surely, 2^212925616165 is an apocalyptic number.

It is an amenable number.

212925616165 is a deficient number, since it is larger than the sum of its proper divisors (60404257547).

212925616165 is a wasteful number, since it uses less digits than its factorization.

212925616165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25824936.

The product of its digits is 388800, while the sum is 46.

The spelling of 212925616165 in words is "two hundred twelve billion, nine hundred twenty-five million, six hundred sixteen thousand, one hundred sixty-five".