222645806865 has 20 divisors (see below), whose sum is σ = 399113224884. Its totient is φ = 118744430112.

The previous prime is 222645806863. The next prime is 222645806947. The reversal of 222645806865 is 568608546222.

It can be written as a sum of positive squares in 2 ways, for example, as 71396374401 + 151249432464 = 267201^2 + 388908^2 .

It is not a de Polignac number, because 222645806865 - 2¹ = 222645806863 is a prime.

It is a super-2 number, since 2×222645806865² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (222645806863) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 274870962 + ... + 274871771.

Almost surely, 2^222645806865 is an apocalyptic number.

It is an amenable number.

222645806865 is a deficient number, since it is larger than the sum of its proper divisors (176467418019).

222645806865 is an equidigital number, since it uses as much as digits as its factorization.

222645806865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549742750 (or 549742741 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 54.

The spelling of 222645806865 in words is "two hundred twenty-two billion, six hundred forty-five million, eight hundred six thousand, eight hundred sixty-five".