155644423 has 4 divisors (see below), whose sum is σ = 169793928. Its totient is φ = 141494920.

The previous prime is 155644399. The next prime is 155644429. The reversal of 155644423 is 324446551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155644423 - 2⁹ = 155643911 is a prime.

It is a super-2 number, since 2×155644423² = 48450372822005858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155644429) 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, 7074736 + ... + 7074757.

It is an arithmetic number, because the mean of its divisors is an integer number (42448482).

Almost surely, 2^155644423 is an apocalyptic number.

155644423 is a deficient number, since it is larger than the sum of its proper divisors (14149505).

155644423 is a wasteful number, since it uses less digits than its factorization.

155644423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14149504.

The product of its digits is 57600, while the sum is 34.

The square root of 155644423 is about 12475.7534041035. The cubic root of 155644423 is about 537.9119443785.

The spelling of 155644423 in words is "one hundred fifty-five million, six hundred forty-four thousand, four hundred twenty-three".