215535142123555 has 4 divisors (see below), whose sum is σ = 258642170548272. Its totient is φ = 172428113698840.

The previous prime is 215535142123549. The next prime is 215535142123589. The reversal of 215535142123555 is 555321241535512.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 215535142123555 - 2³ = 215535142123547 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215535142123499 and 215535142123508.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21553514212351 + ... + 21553514212360.

It is an arithmetic number, because the mean of its divisors is an integer number (64660542637068).

Almost surely, 2^{215535142123555} is an apocalyptic number.

215535142123555 is a deficient number, since it is larger than the sum of its proper divisors (43107028424717).

215535142123555 is an equidigital number, since it uses as much as digits as its factorization.

215535142123555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43107028424716.

The product of its digits is 4500000, while the sum is 49.

The spelling of 215535142123555 in words is "two hundred fifteen trillion, five hundred thirty-five billion, one hundred forty-two million, one hundred twenty-three thousand, five hundred fifty-five".