551220123111 has 16 divisors (see below), whose sum is σ = 840008716800. Its totient is φ = 314962586208.

The previous prime is 551220123089. The next prime is 551220123173. The reversal of 551220123111 is 111321022155.

551220123111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 551220123111 - 2²³ = 551211734503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551220128111) 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, 511531 + ... + 1167948.

It is an arithmetic number, because the mean of its divisors is an integer number (52500544800).

Almost surely, 2^551220123111 is an apocalyptic number.

551220123111 is a deficient number, since it is larger than the sum of its proper divisors (288788593689).

551220123111 is a wasteful number, since it uses less digits than its factorization.

551220123111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695118.

The product of its (nonzero) digits is 600, while the sum is 24.

Adding to 551220123111 its reverse (111321022155), we get a palindrome (662541145266).

The spelling of 551220123111 in words is "five hundred fifty-one billion, two hundred twenty million, one hundred twenty-three thousand, one hundred eleven".