660111506 has 8 divisors (see below), whose sum is σ = 990291504. Its totient is φ = 330014340.

The previous prime is 660111503. The next prime is 660111539. The reversal of 660111506 is 605111066.

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

It is not an unprimeable number, because it can be changed into a prime (660111503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6221 + ... + 36863.

It is an arithmetic number, because the mean of its divisors is an integer number (123786438).

Almost surely, 2^660111506 is an apocalyptic number.

660111506 is a deficient number, since it is larger than the sum of its proper divisors (330179998).

660111506 is a wasteful number, since it uses less digits than its factorization.

660111506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41416.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 660111506 is about 25692.6352482574. The cubic root of 660111506 is about 870.7077985163.

The spelling of 660111506 in words is "six hundred sixty million, one hundred eleven thousand, five hundred six".