660650540 has 96 divisors (see below), whose sum is σ = 1565331264. Its totient is φ = 232104960.

The previous prime is 660650531. The next prime is 660650561. The reversal of 660650540 is 45056066.

It is a junction number, because it is equal to n+sod(n) for n = 660650497 and 660650506.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2254634 + ... + 2254926.

It is an arithmetic number, because the mean of its divisors is an integer number (16305534).

Almost surely, 2^660650540 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 660650540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (782665632).

660650540 is an abundant number, since it is smaller than the sum of its proper divisors (904680724).

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

660650540 is a wasteful number, since it uses less digits than its factorization.

660650540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 660650540 is about 25703.1231565349. The cubic root of 660650540 is about 870.9447349579.

The spelling of 660650540 in words is "six hundred sixty million, six hundred fifty thousand, five hundred forty".