55111006521 has 12 divisors (see below), whose sum is σ = 84287421972. Its totient is φ = 34579454976.

The previous prime is 55111006471. The next prime is 55111006549. The reversal of 55111006521 is 12560011155.

55111006521 is a `hidden beast` number, since 5 + 5 + 1 + 1 + 1 + 0 + 0 + 652 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 37196522496 + 17914484025 = 192864^2 + 133845^2 .

It is not a de Polignac number, because 55111006521 - 2¹⁰ = 55111005497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55111006571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180101176 + ... + 180101481.

It is an arithmetic number, because the mean of its divisors is an integer number (7023951831).

Almost surely, 2^55111006521 is an apocalyptic number.

55111006521 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55111006521 is a deficient number, since it is larger than the sum of its proper divisors (29176415451).

55111006521 is a wasteful number, since it uses less digits than its factorization.

55111006521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360202680 (or 360202677 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

Adding to 55111006521 its reverse (12560011155), we get a palindrome (67671017676).

The spelling of 55111006521 in words is "fifty-five billion, one hundred eleven million, six thousand, five hundred twenty-one".