155566565 has 32 divisors (see below), whose sum is σ = 235063296. Its totient is φ = 96010560.

The previous prime is 155566519. The next prime is 155566589. The reversal of 155566565 is 565665551.

It is not a de Polignac number, because 155566565 - 2¹² = 155562469 is a prime.

It is a super-2 number, since 2×155566565² = 48401912291798450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 37694 + ... + 41616.

It is an arithmetic number, because the mean of its divisors is an integer number (7345728).

Almost surely, 2^155566565 is an apocalyptic number.

It is an amenable number.

155566565 is a deficient number, since it is larger than the sum of its proper divisors (79496731).

155566565 is a wasteful number, since it uses less digits than its factorization.

155566565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4049.

The product of its digits is 675000, while the sum is 44.

The square root of 155566565 is about 12472.6326411067. The cubic root of 155566565 is about 537.8222361991.

The spelling of 155566565 in words is "one hundred fifty-five million, five hundred sixty-six thousand, five hundred sixty-five".