211550545015 has 4 divisors (see below), whose sum is σ = 253860654024. Its totient is φ = 169240436008.

The previous prime is 211550544943. The next prime is 211550545033. The reversal of 211550545015 is 510545055112.

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

It is a cyclic number.

It is not a de Polignac number, because 211550545015 - 2¹³ = 211550536823 is a prime.

It is a super-2 number, since 2×211550545015² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 21155054497 + ... + 21155054506.

It is an arithmetic number, because the mean of its divisors is an integer number (63465163506).

Almost surely, 2^211550545015 is an apocalyptic number.

211550545015 is a deficient number, since it is larger than the sum of its proper divisors (42310109009).

211550545015 is an equidigital number, since it uses as much as digits as its factorization.

211550545015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42310109008.

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 211550545015 in words is "two hundred eleven billion, five hundred fifty million, five hundred forty-five thousand, fifteen".