216526553 has 4 divisors (see below), whose sum is σ = 222378660. Its totient is φ = 210674448.

The previous prime is 216526487. The next prime is 216526567. The reversal of 216526553 is 355625612.

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 123365449 + 93161104 = 11107^2 + 9652^2 .

It is a de Polignac number, because none of the positive numbers 2^k-216526553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216520553) by changing a digit.

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, 2925998 + ... + 2926071.

It is an arithmetic number, because the mean of its divisors is an integer number (55594665).

Almost surely, 2^216526553 is an apocalyptic number.

It is an amenable number.

216526553 is a deficient number, since it is larger than the sum of its proper divisors (5852107).

216526553 is an equidigital number, since it uses as much as digits as its factorization.

216526553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5852106.

The product of its digits is 54000, while the sum is 35.

The square root of 216526553 is about 14714.8412495684. The cubic root of 216526553 is about 600.4871534362.

The spelling of 216526553 in words is "two hundred sixteen million, five hundred twenty-six thousand, five hundred fifty-three".