215530661056603 has 4 divisors (see below), whose sum is σ = 219597277303008. Its totient is φ = 211464044810200.

The previous prime is 215530661056483. The next prime is 215530661056657. The reversal of 215530661056603 is 306650166035512.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215530661056603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215530661056673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2033308123123 + ... + 2033308123228.

It is an arithmetic number, because the mean of its divisors is an integer number (54899319325752).

Almost surely, 2^{215530661056603} is an apocalyptic number.

215530661056603 is a deficient number, since it is larger than the sum of its proper divisors (4066616246405).

215530661056603 is an equidigital number, since it uses as much as digits as its factorization.

215530661056603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4066616246404.

The product of its (nonzero) digits is 2916000, while the sum is 49.

The spelling of 215530661056603 in words is "two hundred fifteen trillion, five hundred thirty billion, six hundred sixty-one million, fifty-six thousand, six hundred three".