212256165465 has 24 divisors (see below), whose sum is σ = 372950565000. Its totient is φ = 111652556544.

The previous prime is 212256165461. The next prime is 212256165491. The reversal of 212256165465 is 564561652212.

212256165465 is a `hidden beast` number, since 2 + 1 + 2 + 25 + 6 + 165 + 465 = 666.

212256165465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1181159424 + 211075006041 = 34368^2 + 459429^2 .

It is not a de Polignac number, because 212256165465 - 2² = 212256165461 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 212256165465.

It is not an unprimeable number, because it can be changed into a prime (212256165461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32303590 + ... + 32310159.

It is an arithmetic number, because the mean of its divisors is an integer number (15539606875).

Almost surely, 2^212256165465 is an apocalyptic number.

It is an amenable number.

212256165465 is a deficient number, since it is larger than the sum of its proper divisors (160694399535).

212256165465 is a wasteful number, since it uses less digits than its factorization.

212256165465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64613833 (or 64613830 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 212256165465 in words is "two hundred twelve billion, two hundred fifty-six million, one hundred sixty-five thousand, four hundred sixty-five".