660195380 has 24 divisors (see below), whose sum is σ = 1493057832. Its totient is φ = 243764352.

The previous prime is 660195379. The next prime is 660195397. The reversal of 660195380 is 83591066.

It can be written as a sum of positive squares in 4 ways, for example, as 7086244 + 653109136 = 2662^2 + 25556^2 .

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 1269347 + ... + 1269866.

It is an arithmetic number, because the mean of its divisors is an integer number (62210743).

Almost surely, 2^660195380 is an apocalyptic number.

It is an amenable number.

660195380 is an abundant number, since it is smaller than the sum of its proper divisors (832862452).

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

660195380 is a wasteful number, since it uses less digits than its factorization.

660195380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2539235 (or 2539233 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 660195380 is about 25694.2674540451. The cubic root of 660195380 is about 870.7446744341.

The spelling of 660195380 in words is "six hundred sixty million, one hundred ninety-five thousand, three hundred eighty".