155223265 has 4 divisors (see below), whose sum is σ = 186267924. Its totient is φ = 124178608.

The previous prime is 155223259. The next prime is 155223301. The reversal of 155223265 is 562322551.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 82428241 + 72795024 = 9079^2 + 8532^2 .

It is a cyclic number.

It is not a de Polignac number, because 155223265 - 2¹¹ = 155221217 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15522322 + ... + 15522331.

It is an arithmetic number, because the mean of its divisors is an integer number (46566981).

Almost surely, 2^155223265 is an apocalyptic number.

It is an amenable number.

155223265 is a deficient number, since it is larger than the sum of its proper divisors (31044659).

155223265 is an equidigital number, since it uses as much as digits as its factorization.

155223265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31044658.

The product of its digits is 18000, while the sum is 31.

The square root of 155223265 is about 12458.8629095917. The cubic root of 155223265 is about 537.4263277429.

The spelling of 155223265 in words is "one hundred fifty-five million, two hundred twenty-three thousand, two hundred sixty-five".