660656505 has 16 divisors (see below), whose sum is σ = 1112685120. Its totient is φ = 333805248.

The previous prime is 660656461. The next prime is 660656519. The reversal of 660656505 is 505656066.

It is a happy number.

660656505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660656505 - 2¹⁴ = 660640121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158762 + ... + 1159331.

It is an arithmetic number, because the mean of its divisors is an integer number (69542820).

Almost surely, 2^660656505 is an apocalyptic number.

It is an amenable number.

660656505 is a deficient number, since it is larger than the sum of its proper divisors (452028615).

660656505 is a wasteful number, since it uses less digits than its factorization.

660656505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2318120.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 660656505 is about 25703.2391927555. The cubic root of 660656505 is about 870.9473561973.

The spelling of 660656505 in words is "six hundred sixty million, six hundred fifty-six thousand, five hundred five".