215561105579 has 2 divisors, whose sum is σ = 215561105580. Its totient is φ = 215561105578.

The previous prime is 215561105509. The next prime is 215561105587. The reversal of 215561105579 is 975501165512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215561105579 is a prime.

It is not a weakly prime, because it can be changed into another prime (215561105509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107780552789 + 107780552790.

It is an arithmetic number, because the mean of its divisors is an integer number (107780552790).

Almost surely, 2^215561105579 is an apocalyptic number.

215561105579 is a deficient number, since it is larger than the sum of its proper divisors (1).

215561105579 is an equidigital number, since it uses as much as digits as its factorization.

215561105579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 472500, while the sum is 47.

The spelling of 215561105579 in words is "two hundred fifteen billion, five hundred sixty-one million, one hundred five thousand, five hundred seventy-nine".