2216534372809 has 3 divisors (see below), whose sum is σ = 2216535861613. Its totient is φ = 2216532884006.

The previous prime is 2216534372783. The next prime is 2216534372839. The reversal of 2216534372809 is 9082734356122.

It is a happy number.

The square root of 2216534372809 is 1488803.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 2216534372809 - 2²³ = 2216525984201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216534372839) 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 2 ways as a sum of consecutive naturals, for example, 744402 + ... + 2233204.

It is a 1-persistent number, because it is pandigital, but 2⋅2216534372809 = 4433068745618 is not.

Almost surely, 2^{2216534372809} is an apocalyptic number.

2216534372809 is the 1488803-rd square number.

2216534372809 is the 744402-nd centered octagonal number.

It is an amenable number.

2216534372809 is a deficient number, since it is larger than the sum of its proper divisors (1488804).

2216534372809 is an frugal number, since it uses more digits than its factorization.

2216534372809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2977606 (or 1488803 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 2216534372809 in words is "two trillion, two hundred sixteen billion, five hundred thirty-four million, three hundred seventy-two thousand, eight hundred nine".