215561105587 has 2 divisors, whose sum is σ = 215561105588. Its totient is φ = 215561105586.

The previous prime is 215561105579. The next prime is 215561105597. The reversal of 215561105587 is 785501165512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 215561105587 - 2³ = 215561105579 is a prime.

It is a super-2 number, since 2×215561105587² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215561105597) 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, 107780552793 + 107780552794.

It is an arithmetic number, because the mean of its divisors is an integer number (107780552794).

Almost surely, 2^215561105587 is an apocalyptic number.

215561105587 is a deficient number, since it is larger than the sum of its proper divisors (1).

215561105587 is an equidigital number, since it uses as much as digits as its factorization.

215561105587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 420000, while the sum is 46.

The spelling of 215561105587 in words is "two hundred fifteen billion, five hundred sixty-one million, one hundred five thousand, five hundred eighty-seven".