661030 has 8 divisors (see below), whose sum is σ = 1189872. Its totient is φ = 264408.

The previous prime is 661027. The next prime is 661049. The reversal of 661030 is 30166.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 660995 and 661013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33042 + ... + 33061.

It is an arithmetic number, because the mean of its divisors is an integer number (148734).

2⁶⁶¹⁰³⁰ is an apocalyptic number.

661030 is a deficient number, since it is larger than the sum of its proper divisors (528842).

661030 is a wasteful number, since it uses less digits than its factorization.

661030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66110.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 661030 is about 813.0375145096. The cubic root of 661030 is about 87.1111452163. Note that the first 4 decimals are identical.

Adding to 661030 its reverse (30166), we get a palindrome (691196).

The spelling of 661030 in words is "six hundred sixty-one thousand, thirty".