7217664385 has 16 divisors (see below), whose sum is σ = 9073814400. Its totient is φ = 5501056000.

The previous prime is 7217664383. The next prime is 7217664397. The reversal of 7217664385 is 5834667127.

It is not a de Polignac number, because 7217664385 - 2¹ = 7217664383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7217664383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96160 + ... + 153889.

It is an arithmetic number, because the mean of its divisors is an integer number (567113400).

Almost surely, 2^7217664385 is an apocalyptic number.

It is an amenable number.

7217664385 is a deficient number, since it is larger than the sum of its proper divisors (1856150015).

7217664385 is a wasteful number, since it uses less digits than its factorization.

7217664385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250328.

The product of its digits is 1693440, while the sum is 49.

The square root of 7217664385 is about 84956.8383651369. The cubic root of 7217664385 is about 1932.5566254947.

The spelling of 7217664385 in words is "seven billion, two hundred seventeen million, six hundred sixty-four thousand, three hundred eighty-five".