215623532401265 has 8 divisors (see below), whose sum is σ = 258748318838760. Its totient is φ = 172498772616192.

The previous prime is 215623532401247. The next prime is 215623532401273. The reversal of 215623532401265 is 562104235326512.

It can be written as a sum of positive squares in 4 ways, for example, as 137135131041841 + 78488401359424 = 11710471^2 + 8859368^2 .

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 215623532401265 - 2¹⁸ = 215623532139121 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23780327 + ... + 31571363.

It is an arithmetic number, because the mean of its divisors is an integer number (32343539854845).

Almost surely, 2^{215623532401265} is an apocalyptic number.

It is an amenable number.

215623532401265 is a deficient number, since it is larger than the sum of its proper divisors (43124786437495).

215623532401265 is an equidigital number, since it uses as much as digits as its factorization.

215623532401265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13326211.

The product of its (nonzero) digits is 2592000, while the sum is 47.

Adding to 215623532401265 its reverse (562104235326512), we get a palindrome (777727767727777).

The spelling of 215623532401265 in words is "two hundred fifteen trillion, six hundred twenty-three billion, five hundred thirty-two million, four hundred one thousand, two hundred sixty-five".