155505555 has 32 divisors (see below), whose sum is σ = 278476800. Its totient is φ = 82329696.

The previous prime is 155505547. The next prime is 155505577. The reversal of 155505555 is 555505551.

It is a happy number.

155505555 is a `hidden beast` number, since 1 + 5 + 550 + 55 + 55 = 666.

It is not a de Polignac number, because 155505555 - 2³ = 155505547 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14622 + ... + 22908.

It is an arithmetic number, because the mean of its divisors is an integer number (8702400).

Almost surely, 2^155505555 is an apocalyptic number.

155505555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155505555 is a deficient number, since it is larger than the sum of its proper divisors (122971245).

155505555 is a wasteful number, since it uses less digits than its factorization.

155505555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440 (or 8434 counting only the distinct ones).

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

The square root of 155505555 is about 12470.1866465583. The cubic root of 155505555 is about 537.7519194079.

The spelling of 155505555 in words is "one hundred fifty-five million, five hundred five thousand, five hundred fifty-five".