111220556506 has 4 divisors (see below), whose sum is σ = 166830834762. Its totient is φ = 55610278252.

The previous prime is 111220556483. The next prime is 111220556549. The reversal of 111220556506 is 605655022111.

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

It can be written as a sum of positive squares in only one way, i.e., 90357354025 + 20863202481 = 300595^2 + 144441^2 .

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 as a sum of consecutive naturals, namely, 27805139125 + ... + 27805139128.

Almost surely, 2^111220556506 is an apocalyptic number.

111220556506 is a deficient number, since it is larger than the sum of its proper divisors (55610278256).

111220556506 is an equidigital number, since it uses as much as digits as its factorization.

111220556506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55610278255.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 111220556506 its reverse (605655022111), we get a palindrome (716875578617).

The spelling of 111220556506 in words is "one hundred eleven billion, two hundred twenty million, five hundred fifty-six thousand, five hundred six".