660115021 has 8 divisors (see below), whose sum is σ = 671464640. Its totient is φ = 648809568.

The previous prime is 660115007. The next prime is 660115033. The reversal of 660115021 is 120511066.

660115021 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 a cyclic number.

It is not a de Polignac number, because 660115021 - 2⁵ = 660114989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660114983 and 660115001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660115051) 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, 19840 + ... + 41398.

It is an arithmetic number, because the mean of its divisors is an integer number (83933080).

Almost surely, 2^660115021 is an apocalyptic number.

It is an amenable number.

660115021 is a deficient number, since it is larger than the sum of its proper divisors (11349619).

660115021 is a wasteful number, since it uses less digits than its factorization.

660115021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22083.

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 660115021 is about 25692.7036529829. The cubic root of 660115021 is about 870.7093439786.

Adding to 660115021 its reverse (120511066), we get a palindrome (780626087).

The spelling of 660115021 in words is "six hundred sixty million, one hundred fifteen thousand, twenty-one".