7220108561 has 4 divisors (see below), whose sum is σ = 7263342912. Its totient is φ = 7176874212.

The previous prime is 7220108551. The next prime is 7220108563. The reversal of 7220108561 is 1658010227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1658010227 = 109 ⋅15211103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7220108561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7220108563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21616925 + ... + 21617258.

It is an arithmetic number, because the mean of its divisors is an integer number (1815835728).

Almost surely, 2^7220108561 is an apocalyptic number.

It is an amenable number.

7220108561 is a deficient number, since it is larger than the sum of its proper divisors (43234351).

7220108561 is a wasteful number, since it uses less digits than its factorization.

7220108561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43234350.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 7220108561 is about 84971.2219577899. The cubic root of 7220108561 is about 1932.7747466294.

Adding to 7220108561 its reverse (1658010227), we get a palindrome (8878118788).

The spelling of 7220108561 in words is "seven billion, two hundred twenty million, one hundred eight thousand, five hundred sixty-one".