215212166100565 has 32 divisors (see below), whose sum is σ = 271750902444000. Its totient is φ = 163402267852800.

The previous prime is 215212166100551. The next prime is 215212166100577. The reversal of 215212166100565 is 565001661212512.

It can be written as a sum of positive squares in 16 ways, for example, as 119871119353489 + 95341046747076 = 10948567^2 + 9764274^2 .

It is not a de Polignac number, because 215212166100565 - 2⁹ = 215212166100053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41138485 + ... + 46073845.

It is an arithmetic number, because the mean of its divisors is an integer number (8492215701375).

Almost surely, 2^{215212166100565} is an apocalyptic number.

It is an amenable number.

215212166100565 is a deficient number, since it is larger than the sum of its proper divisors (56538736343435).

215212166100565 is a wasteful number, since it uses less digits than its factorization.

215212166100565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4941193.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 215212166100565 in words is "two hundred fifteen trillion, two hundred twelve billion, one hundred sixty-six million, one hundred thousand, five hundred sixty-five".