660644041 has 8 divisors (see below), whose sum is σ = 719395200. Its totient is φ = 604290960.

The previous prime is 660644009. The next prime is 660644077. The reversal of 660644041 is 140446066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660644041 - 2⁵ = 660644009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660643994 and 660644012.

It is not an unprimeable number, because it can be changed into a prime (660644141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 598945 + ... + 600046.

It is an arithmetic number, because the mean of its divisors is an integer number (89924400).

Almost surely, 2^660644041 is an apocalyptic number.

It is an amenable number.

660644041 is a deficient number, since it is larger than the sum of its proper divisors (58751159).

660644041 is a wasteful number, since it uses less digits than its factorization.

660644041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1199039.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 660644041 is about 25702.9967318988. The cubic root of 660644041 is about 870.9418790413.

The spelling of 660644041 in words is "six hundred sixty million, six hundred forty-four thousand, forty-one".