155555543 has 18 divisors (see below), whose sum is σ = 185171112. Its totient is φ = 130518960.

The previous prime is 155555539. The next prime is 155555549. The reversal of 155555543 is 345555551.

It is a happy number.

It is not a de Polignac number, because 155555543 - 2² = 155555539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 155555497 and 155555506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555549) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 16646 + ... + 24252.

It is an arithmetic number, because the mean of its divisors is an integer number (10287284).

Almost surely, 2^155555543 is an apocalyptic number.

155555543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

155555543 is a deficient number, since it is larger than the sum of its proper divisors (29615569).

155555543 is a wasteful number, since it uses less digits than its factorization.

155555543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7655 (or 7631 counting only the distinct ones).

The product of its digits is 187500, while the sum is 38.

The square root of 155555543 is about 12472.1907859045. The cubic root of 155555543 is about 537.8095342052.

The spelling of 155555543 in words is "one hundred fifty-five million, five hundred fifty-five thousand, five hundred forty-three".