155555055 has 24 divisors (see below), whose sum is σ = 278328960. Its totient is φ = 80285760.

The previous prime is 155555051. The next prime is 155555087. The reversal of 155555055 is 550555551.

It is a happy number.

155555055 is a `hidden beast` number, since 1 + 5 + 55 + 550 + 55 = 666.

It is not a de Polignac number, because 155555055 - 2² = 155555051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155555051) 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, 54360 + ... + 57149.

It is an arithmetic number, because the mean of its divisors is an integer number (11597040).

Almost surely, 2^155555055 is an apocalyptic number.

155555055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155555055 is a deficient number, since it is larger than the sum of its proper divisors (122773905).

155555055 is a wasteful number, since it uses less digits than its factorization.

155555055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111551 (or 111548 counting only the distinct ones).

The product of its (nonzero) digits is 78125, while the sum is 36.

The square root of 155555055 is about 12472.1712223654. The cubic root of 155555055 is about 537.8089718095.

The spelling of 155555055 in words is "one hundred fifty-five million, five hundred fifty-five thousand, fifty-five".