215652440345 has 8 divisors (see below), whose sum is σ = 258825717576. Its totient is φ = 172493426176.

The previous prime is 215652440309. The next prime is 215652440347. The reversal of 215652440345 is 543044256512.

It can be written as a sum of positive squares in 4 ways, for example, as 22898952976 + 192753487369 = 151324^2 + 439037^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 215652440345 - 2¹⁸ = 215652178201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215652440347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3532472 + ... + 3593001.

It is an arithmetic number, because the mean of its divisors is an integer number (32353214697).

Almost surely, 2^215652440345 is an apocalyptic number.

It is an amenable number.

215652440345 is a deficient number, since it is larger than the sum of its proper divisors (43173277231).

215652440345 is an equidigital number, since it uses as much as digits as its factorization.

215652440345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7131531.

The product of its (nonzero) digits is 576000, while the sum is 41.

Adding to 215652440345 its reverse (543044256512), we get a palindrome (758696696857).

The spelling of 215652440345 in words is "two hundred fifteen billion, six hundred fifty-two million, four hundred forty thousand, three hundred forty-five".