105505550591 has 4 divisors (see below), whose sum is σ = 120577772112. Its totient is φ = 90433329072.

The previous prime is 105505550587. The next prime is 105505550617. The reversal of 105505550591 is 195055505501.

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

It is a cyclic number.

It is not a de Polignac number, because 105505550591 - 2² = 105505550587 is a prime.

It is a super-2 number, since 2×105505550591² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105505550291) 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, 7536110750 + ... + 7536110763.

It is an arithmetic number, because the mean of its divisors is an integer number (30144443028).

Almost surely, 2^105505550591 is an apocalyptic number.

105505550591 is a deficient number, since it is larger than the sum of its proper divisors (15072221521).

105505550591 is an equidigital number, since it uses as much as digits as its factorization.

105505550591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15072221520.

The product of its (nonzero) digits is 140625, while the sum is 41.

The spelling of 105505550591 in words is "one hundred five billion, five hundred five million, five hundred fifty thousand, five hundred ninety-one".