660641613 has 8 divisors (see below), whose sum is σ = 882050400. Its totient is φ = 439830288.

The previous prime is 660641599. The next prime is 660641617. The reversal of 660641613 is 316146066.

660641613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 660641613 - 2⁸ = 660641357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660641617) 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, 146778 + ... + 151211.

It is an arithmetic number, because the mean of its divisors is an integer number (110256300).

Almost surely, 2^660641613 is an apocalyptic number.

It is an amenable number.

660641613 is a deficient number, since it is larger than the sum of its proper divisors (221408787).

660641613 is a wasteful number, since it uses less digits than its factorization.

660641613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298731.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 660641613 is about 25702.9495000087. The cubic root of 660641613 is about 870.9408120777.

Adding to 660641613 its reverse (316146066), we get a palindrome (976787679).

The spelling of 660641613 in words is "six hundred sixty million, six hundred forty-one thousand, six hundred thirteen".