661042 has 8 divisors (see below), whose sum is σ = 1018476. Its totient is φ = 321552.

The previous prime is 661027. The next prime is 661049. The reversal of 661042 is 240166.

It can be written as a sum of positive squares in 2 ways, for example, as 654481 + 6561 = 809^2 + 81^2 .

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

It is not an unprimeable number, because it can be changed into a prime (661049) 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, 4393 + ... + 4540.

2⁶⁶¹⁰⁴² is an apocalyptic number.

661042 is a deficient number, since it is larger than the sum of its proper divisors (357434).

661042 is a wasteful number, since it uses less digits than its factorization.

661042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8972.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 661042 is about 813.0448942094. The cubic root of 661042 is about 87.1116723368. Note that the first 3 decimals are identical.

The spelling of 661042 in words is "six hundred sixty-one thousand, forty-two".