661443 has 8 divisors (see below), whose sum is σ = 891408. Its totient is φ = 436224.

The previous prime is 661439. The next prime is 661459. The reversal of 661443 is 344166.

661443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661443 - 2² = 661439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 846 + ... + 1427.

It is an arithmetic number, because the mean of its divisors is an integer number (111426).

2⁶⁶¹⁴⁴³ is an apocalyptic number.

661443 is a deficient number, since it is larger than the sum of its proper divisors (229965).

661443 is a wasteful number, since it uses less digits than its factorization.

661443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373.

The product of its digits is 1728, while the sum is 24.

The square root of 661443 is about 813.2914606708. The cubic root of 661443 is about 87.1292832801.

The spelling of 661443 in words is "six hundred sixty-one thousand, four hundred forty-three".