156223645 has 4 divisors (see below), whose sum is σ = 187468380. Its totient is φ = 124978912.

The previous prime is 156223637. The next prime is 156223649. The reversal of 156223645 is 546322651.

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 104080804 + 52142841 = 10202^2 + 7221^2 .

It is a cyclic number.

It is not a de Polignac number, because 156223645 - 2³ = 156223637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 156223645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156223649) 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, 15622360 + ... + 15622369.

It is an arithmetic number, because the mean of its divisors is an integer number (46867095).

Almost surely, 2^156223645 is an apocalyptic number.

It is an amenable number.

156223645 is a deficient number, since it is larger than the sum of its proper divisors (31244735).

156223645 is an equidigital number, since it uses as much as digits as its factorization.

156223645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31244734.

The product of its digits is 43200, while the sum is 34.

The square root of 156223645 is about 12498.9457555427. The cubic root of 156223645 is about 538.5783880712.

The spelling of 156223645 in words is "one hundred fifty-six million, two hundred twenty-three thousand, six hundred forty-five".