661096 has 16 divisors (see below), whose sum is σ = 1312740. Its totient is φ = 311040.

The previous prime is 661093. The next prime is 661097. The reversal of 661096 is 690166.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 562500 + 98596 = 750^2 + 314^2 .

It is not an unprimeable number, because it can be changed into a prime (661091) 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, 2295 + ... + 2566.

2⁶⁶¹⁰⁹⁶ is an apocalyptic number.

It is an amenable number.

661096 is a deficient number, since it is larger than the sum of its proper divisors (651644).

661096 is a wasteful number, since it uses less digits than its factorization.

661096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884 (or 4880 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 661096 is about 813.0781020296. The cubic root of 661096 is about 87.1140443002.

The spelling of 661096 in words is "six hundred sixty-one thousand, ninety-six".