155555565 has 96 divisors (see below), whose sum is σ = 301017600. Its totient is φ = 67818240.

The previous prime is 155555549. The next prime is 155555573. The reversal of 155555565 is 565555551.

It is not a de Polignac number, because 155555565 - 2⁴ = 155555549 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2636506 + ... + 2636564.

It is an arithmetic number, because the mean of its divisors is an integer number (3135600).

Almost surely, 2^155555565 is an apocalyptic number.

155555565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155555565 is a deficient number, since it is larger than the sum of its proper divisors (145462035).

155555565 is a wasteful number, since it uses less digits than its factorization.

155555565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 126 counting only the distinct ones).

The product of its digits is 468750, while the sum is 42.

The square root of 155555565 is about 12472.1916678666. The cubic root of 155555565 is about 537.8095595591.

The spelling of 155555565 in words is "one hundred fifty-five million, five hundred fifty-five thousand, five hundred sixty-five".