155564223 has 4 divisors (see below), whose sum is σ = 207418968. Its totient is φ = 103709480.

The previous prime is 155564183. The next prime is 155564261. The reversal of 155564223 is 322465551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322465551 = 3 ⋅107488517.

It is a cyclic number.

It is not a de Polignac number, because 155564223 - 2¹² = 155560127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155564273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25927368 + ... + 25927373.

It is an arithmetic number, because the mean of its divisors is an integer number (51854742).

Almost surely, 2^155564223 is an apocalyptic number.

155564223 is a deficient number, since it is larger than the sum of its proper divisors (51854745).

155564223 is an equidigital number, since it uses as much as digits as its factorization.

155564223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51854744.

The product of its digits is 36000, while the sum is 33.

The square root of 155564223 is about 12472.5387552014. The cubic root of 155564223 is about 537.8195372773.

The spelling of 155564223 in words is "one hundred fifty-five million, five hundred sixty-four thousand, two hundred twenty-three".