660140250 has 384 divisors, whose sum is σ = 2212614144. Its totient is φ = 129360000.

The previous prime is 660140219. The next prime is 660140279. The reversal of 660140250 is 52041066.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 660140250.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 9297715 + ... + 9297785.

It is an arithmetic number, because the mean of its divisors is an integer number (5762016).

Almost surely, 2^660140250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660140250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1106307072).

660140250 is an abundant number, since it is smaller than the sum of its proper divisors (1552473894).

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

660140250 is a wasteful number, since it uses less digits than its factorization.

660140250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 660140250 is about 25693.1946242580. The cubic root of 660140250 is about 870.7204364123.

The spelling of 660140250 in words is "six hundred sixty million, one hundred forty thousand, two hundred fifty".