661050560 has 56 divisors (see below), whose sum is σ = 1578108096. Its totient is φ = 263751680.

The previous prime is 661050529. The next prime is 661050583. The reversal of 661050560 is 65050166.

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, 135524 + ... + 140316.

Almost surely, 2^661050560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 661050560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789054048).

661050560 is an abundant number, since it is smaller than the sum of its proper divisors (917057536).

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

661050560 is a wasteful number, since it uses less digits than its factorization.

661050560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5241 (or 5231 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 661050560 is about 25710.9035236026. The cubic root of 661050560 is about 871.1204834554.

The spelling of 661050560 in words is "six hundred sixty-one million, fifty thousand, five hundred sixty".