215231244066 has 32 divisors (see below), whose sum is σ = 503464900800. Its totient is φ = 67967760960.

The previous prime is 215231244061. The next prime is 215231244091. The reversal of 215231244066 is 660442132512.

215231244066 is a `hidden beast` number, since 2 + 1 + 523 + 124 + 4 + 0 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 215231244066.

It is not an unprimeable number, because it can be changed into a prime (215231244061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104887495 + ... + 104889546.

It is an arithmetic number, because the mean of its divisors is an integer number (15733278150).

Almost surely, 2^215231244066 is an apocalyptic number.

215231244066 is an abundant number, since it is smaller than the sum of its proper divisors (288233656734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215231244066 is a wasteful number, since it uses less digits than its factorization.

215231244066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209777071 (or 209777065 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 215231244066 its reverse (660442132512), we get a palindrome (875673376578).

The spelling of 215231244066 in words is "two hundred fifteen billion, two hundred thirty-one million, two hundred forty-four thousand, sixty-six".