156645 has 18 divisors (see below), whose sum is σ = 276198. Its totient is φ = 82128.

The previous prime is 156641. The next prime is 156659. The reversal of 156645 is 546651.

It is a happy number.

156645 is a `hidden beast` number, since 15 + 6 + 645 = 666.

It can be written as a sum of positive squares in only one way, i.e., 125316 + 31329 = 354^2 + 177^2 .

It is not a de Polignac number, because 156645 - 2² = 156641 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

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 17 ways as a sum of consecutive naturals, for example, 2626 + ... + 2684.

2¹⁵⁶⁶⁴⁵ is an apocalyptic number.

156645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

156645 is a deficient number, since it is larger than the sum of its proper divisors (119553).

156645 is an equidigital number, since it uses as much as digits as its factorization.

156645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 67 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 156645 is about 395.7840320175. The cubic root of 156645 is about 53.9062158160.

The spelling of 156645 in words is "one hundred fifty-six thousand, six hundred forty-five".