215605224009 has 80 divisors (see below), whose sum is σ = 376072259200. Its totient is φ = 120551639040.

The previous prime is 215605223993. The next prime is 215605224019. The reversal of 215605224009 is 900422506512.

215605224009 is a `hidden beast` number, since 2 + 1 + 5 + 605 + 2 + 2 + 40 + 0 + 9 = 666.

It is not a de Polignac number, because 215605224009 - 2⁴ = 215605223993 is a prime.

It is a super-2 number, since 2×215605224009² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215605224019) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6659142 + ... + 6691440.

It is an arithmetic number, because the mean of its divisors is an integer number (4700903240).

Almost surely, 2^215605224009 is an apocalyptic number.

It is an amenable number.

215605224009 is a deficient number, since it is larger than the sum of its proper divisors (160467035191).

215605224009 is a wasteful number, since it uses less digits than its factorization.

215605224009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32572 (or 32563 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 215605224009 in words is "two hundred fifteen billion, six hundred five million, two hundred twenty-four thousand, nine".