1722220505 has 8 divisors (see below), whose sum is σ = 2068618824. Its totient is φ = 1376473600.

The previous prime is 1722220433. The next prime is 1722220529. The reversal of 1722220505 is 5050222271.

It can be written as a sum of positive squares in 4 ways, for example, as 317694976 + 1404525529 = 17824^2 + 37477^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1722220505 - 2¹² = 1722216409 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157016 + ... + 167625.

It is an arithmetic number, because the mean of its divisors is an integer number (258577353).

Almost surely, 2^1722220505 is an apocalyptic number.

It is an amenable number.

1722220505 is a deficient number, since it is larger than the sum of its proper divisors (346398319).

1722220505 is a wasteful number, since it uses less digits than its factorization.

1722220505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325707.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 1722220505 is about 41499.6446370327. The cubic root of 1722220505 is about 1198.6606596308.

Adding to 1722220505 its reverse (5050222271), we get a palindrome (6772442776).

The spelling of 1722220505 in words is "one billion, seven hundred twenty-two million, two hundred twenty thousand, five hundred five".