215981298355 has 4 divisors (see below), whose sum is σ = 259177558032. Its totient is φ = 172785038680.

The previous prime is 215981298347. The next prime is 215981298371. The reversal of 215981298355 is 553892189512.

215981298355 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 215981298355 - 2³ = 215981298347 is a prime.

It is a super-2 number, since 2×215981298355² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215981298355.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21598129831 + ... + 21598129840.

It is an arithmetic number, because the mean of its divisors is an integer number (64794389508).

Almost surely, 2^215981298355 is an apocalyptic number.

215981298355 is a deficient number, since it is larger than the sum of its proper divisors (43196259677).

215981298355 is an equidigital number, since it uses as much as digits as its factorization.

215981298355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43196259676.

The product of its digits is 7776000, while the sum is 58.

The spelling of 215981298355 in words is "two hundred fifteen billion, nine hundred eighty-one million, two hundred ninety-eight thousand, three hundred fifty-five".