661050 has 72 divisors (see below), whose sum is σ = 1929564. Its totient is φ = 161280.

The previous prime is 661049. The next prime is 661061. The reversal of 661050 is 50166.

661050 is a `hidden beast` number, since 6 + 610 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 9801 + 651249 = 99^2 + 807^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5794 + ... + 5906.

2⁶⁶¹⁰⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964782).

661050 is an abundant number, since it is smaller than the sum of its proper divisors (1268514).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661050 is a wasteful number, since it uses less digits than its factorization.

661050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 661050 is about 813.0498139721. The cubic root of 661050 is about 87.1120237469.

The spelling of 661050 in words is "six hundred sixty-one thousand, fifty".