123345521217 has 12 divisors (see below), whose sum is σ = 178171087380. Its totient is φ = 82227885408.

The previous prime is 123345521153. The next prime is 123345521219. The reversal of 123345521217 is 712125543321.

123345521217 is a `hidden beast` number, since 123 + 3 + 4 + 5 + 521 + 2 + 1 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 77326261776 + 46019259441 = 278076^2 + 214521^2 .

It is not a de Polignac number, because 123345521217 - 2⁶ = 123345521153 is a prime.

It is a super-2 number, since 2×123345521217² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123345521219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143259 + ... + 516927.

It is an arithmetic number, because the mean of its divisors is an integer number (14847590615).

Almost surely, 2^123345521217 is an apocalyptic number.

It is an amenable number.

123345521217 is a deficient number, since it is larger than the sum of its proper divisors (54825566163).

123345521217 is a wasteful number, since it uses less digits than its factorization.

123345521217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410352 (or 410349 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The spelling of 123345521217 in words is "one hundred twenty-three billion, three hundred forty-five million, five hundred twenty-one thousand, two hundred seventeen".