215556545053515 has 16 divisors (see below), whose sum is σ = 345458660686848. Its totient is φ = 114774094494816.

The previous prime is 215556545053513. The next prime is 215556545053613. The reversal of 215556545053515 is 515350545655512.

It is not a de Polignac number, because 215556545053515 - 2¹ = 215556545053513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215556545053511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11837253117 + ... + 11837271326.

It is an arithmetic number, because the mean of its divisors is an integer number (21591166292928).

Almost surely, 2^{215556545053515} is an apocalyptic number.

215556545053515 is a deficient number, since it is larger than the sum of its proper divisors (129902115633333).

215556545053515 is a wasteful number, since it uses less digits than its factorization.

215556545053515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23674525058.

The product of its (nonzero) digits is 56250000, while the sum is 57.

The spelling of 215556545053515 in words is "two hundred fifteen trillion, five hundred fifty-six billion, five hundred forty-five million, fifty-three thousand, five hundred fifteen".