155823553 has 4 divisors (see below), whose sum is σ = 156355668. Its totient is φ = 155291440.

The previous prime is 155823533. The next prime is 155823559. The reversal of 155823553 is 355328551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355328551 = 569 ⋅624479.

It can be written as a sum of positive squares in 2 ways, for example, as 83777409 + 72046144 = 9153^2 + 8488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155823553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155823559) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 265618 + ... + 266203.

It is an arithmetic number, because the mean of its divisors is an integer number (39088917).

Almost surely, 2^155823553 is an apocalyptic number.

It is an amenable number.

155823553 is a deficient number, since it is larger than the sum of its proper divisors (532115).

155823553 is an equidigital number, since it uses as much as digits as its factorization.

155823553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532114.

The product of its digits is 90000, while the sum is 37.

The square root of 155823553 is about 12482.9304652393. The cubic root of 155823553 is about 538.1182248717.

The spelling of 155823553 in words is "one hundred fifty-five million, eight hundred twenty-three thousand, five hundred fifty-three".