661285060 has 24 divisors (see below), whose sum is σ = 1389199896. Its totient is φ = 264418560.

The previous prime is 661285049. The next prime is 661285073. The reversal of 661285060 is 60582166.

It can be written as a sum of positive squares in 4 ways, for example, as 31877316 + 629407744 = 5646^2 + 25088^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83680 + ... + 91240.

It is an arithmetic number, because the mean of its divisors is an integer number (57883329).

Almost surely, 2^661285060 is an apocalyptic number.

It is an amenable number.

661285060 is an abundant number, since it is smaller than the sum of its proper divisors (727914836).

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

661285060 is a wasteful number, since it uses less digits than its factorization.

661285060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11943 (or 11941 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 661285060 is about 25715.4634412837. The cubic root of 661285060 is about 871.2234778986.

The spelling of 661285060 in words is "six hundred sixty-one million, two hundred eighty-five thousand, sixty".