156643 has 6 divisors (see below), whose sum is σ = 162852. Its totient is φ = 150660.

The previous prime is 156641. The next prime is 156659. The reversal of 156643 is 346651.

It is not a de Polignac number, because 156643 - 2¹ = 156641 is a prime.

It is a Duffinian number.

156643 is a lucky number.

It is a plaindrome in base 9.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (156641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 880 + ... + 1042.

It is an arithmetic number, because the mean of its divisors is an integer number (27142).

2¹⁵⁶⁶⁴³ is an apocalyptic number.

156643 is a deficient number, since it is larger than the sum of its proper divisors (6209).

156643 is an equidigital number, since it uses as much as digits as its factorization.

156643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225 (or 194 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 156643 is about 395.7815053789. The cubic root of 156643 is about 53.9059863951.

It can be divided in two parts, 1 and 56643, that added together give a square (56644 = 238²).

The spelling of 156643 in words is "one hundred fifty-six thousand, six hundred forty-three".