105551555543 has 4 divisors (see below), whose sum is σ = 120630349200. Its totient is φ = 90472761888.

The previous prime is 105551555537. The next prime is 105551555579. The reversal of 105551555543 is 345555155501.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105551555543 is a prime.

It is a super-2 number, since 2×105551555543² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105551555494 and 105551555503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105551555533) 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, 7539396818 + ... + 7539396831.

It is an arithmetic number, because the mean of its divisors is an integer number (30157587300).

Almost surely, 2^105551555543 is an apocalyptic number.

105551555543 is a deficient number, since it is larger than the sum of its proper divisors (15078793657).

105551555543 is an equidigital number, since it uses as much as digits as its factorization.

105551555543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078793656.

The product of its (nonzero) digits is 937500, while the sum is 44.

The spelling of 105551555543 in words is "one hundred five billion, five hundred fifty-one million, five hundred fifty-five thousand, five hundred forty-three".