155866223 has 4 divisors (see below), whose sum is σ = 155893128. Its totient is φ = 155839320.

The previous prime is 155866189. The next prime is 155866247. The reversal of 155866223 is 322668551.

155866223 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 322668551 = 17 ⋅18980503.

It is a cyclic number.

It is not a de Polignac number, because 155866223 - 2¹⁸ = 155604079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155866273) 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, 788 + ... + 17673.

It is an arithmetic number, because the mean of its divisors is an integer number (38973282).

Almost surely, 2^155866223 is an apocalyptic number.

155866223 is a deficient number, since it is larger than the sum of its proper divisors (26905).

155866223 is an equidigital number, since it uses as much as digits as its factorization.

155866223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26904.

The product of its digits is 86400, while the sum is 38.

The square root of 155866223 is about 12484.6394821797. The cubic root of 155866223 is about 538.1673389896.

The spelling of 155866223 in words is "one hundred fifty-five million, eight hundred sixty-six thousand, two hundred twenty-three".