215551044353 has 4 divisors (see below), whose sum is σ = 217528576980. Its totient is φ = 213573511728.

The previous prime is 215551044347. The next prime is 215551044431. The reversal of 215551044353 is 353440155512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 129879510544 + 85671533809 = 360388^2 + 292697^2 .

It is a cyclic number.

It is not a de Polignac number, because 215551044353 - 2²⁰ = 215549995777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215551044343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988766150 + ... + 988766367.

It is an arithmetic number, because the mean of its divisors is an integer number (54382144245).

Almost surely, 2^215551044353 is an apocalyptic number.

It is an amenable number.

215551044353 is a deficient number, since it is larger than the sum of its proper divisors (1977532627).

215551044353 is a wasteful number, since it uses less digits than its factorization.

215551044353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1977532626.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 215551044353 its reverse (353440155512), we get a palindrome (568991199865).

The spelling of 215551044353 in words is "two hundred fifteen billion, five hundred fifty-one million, forty-four thousand, three hundred fifty-three".