215165513455663 has 4 divisors (see below), whose sum is σ = 215165706257440. Its totient is φ = 215165320653888.

The previous prime is 215165513455643. The next prime is 215165513455679. The reversal of 215165513455663 is 366554315561512.

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

It is a cyclic number.

It is not a de Polignac number, because 215165513455663 - 2¹⁷ = 215165513324591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 215165513455598 and 215165513455607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215165513455643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94717095 + ... + 96962152.

It is an arithmetic number, because the mean of its divisors is an integer number (53791426564360).

Almost surely, 2^{215165513455663} is an apocalyptic number.

215165513455663 is a deficient number, since it is larger than the sum of its proper divisors (192801777).

215165513455663 is a wasteful number, since it uses less digits than its factorization.

215165513455663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192801776.

The product of its digits is 48600000, while the sum is 58.

The spelling of 215165513455663 in words is "two hundred fifteen trillion, one hundred sixty-five billion, five hundred thirteen million, four hundred fifty-five thousand, six hundred sixty-three".