660261983639 has 8 divisors (see below), whose sum is σ = 665485977600. Its totient is φ = 655038381816.

The previous prime is 660261983609. The next prime is 660261983651. The reversal of 660261983639 is 936389162066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660261983639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660261983609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3936512 + ... + 4100810.

It is an arithmetic number, because the mean of its divisors is an integer number (83185747200).

Almost surely, 2^660261983639 is an apocalyptic number.

660261983639 is a deficient number, since it is larger than the sum of its proper divisors (5223993961).

660261983639 is a wasteful number, since it uses less digits than its factorization.

660261983639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196069.

The product of its (nonzero) digits is 15116544, while the sum is 59.

The spelling of 660261983639 in words is "six hundred sixty billion, two hundred sixty-one million, nine hundred eighty-three thousand, six hundred thirty-nine".