55115111511 has 24 divisors (see below), whose sum is σ = 84307414464. Its totient is φ = 34576404480.

The previous prime is 55115111501. The next prime is 55115111521. The reversal of 55115111511 is 11511151155.

55115111511 is a `hidden beast` number, since 551 + 1 + 51 + 11 + 51 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (55115111501) and next prime (55115111521).

It is not a de Polignac number, because 55115111511 - 2¹¹ = 55115109463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55115111501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1041666 + ... + 1093296.

It is an arithmetic number, because the mean of its divisors is an integer number (3512808936).

Almost surely, 2^55115111511 is an apocalyptic number.

55115111511 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55115111511 is a deficient number, since it is larger than the sum of its proper divisors (29192302953).

55115111511 is a wasteful number, since it uses less digits than its factorization.

55115111511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58631 (or 58628 counting only the distinct ones).

The product of its digits is 625, while the sum is 27.

Adding to 55115111511 its reverse (11511151155), we get a palindrome (66626262666).

The spelling of 55115111511 in words is "fifty-five billion, one hundred fifteen million, one hundred eleven thousand, five hundred eleven".