660480999 has 4 divisors (see below), whose sum is σ = 880641336. Its totient is φ = 440320664.

The previous prime is 660480959. The next prime is 660481007. The reversal of 660480999 is 999084066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660480999 - 2¹² = 660476903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660480959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110080164 + ... + 110080169.

It is an arithmetic number, because the mean of its divisors is an integer number (220160334).

Almost surely, 2^660480999 is an apocalyptic number.

660480999 is a deficient number, since it is larger than the sum of its proper divisors (220160337).

660480999 is a wasteful number, since it uses less digits than its factorization.

660480999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220160336.

The product of its (nonzero) digits is 839808, while the sum is 51.

The square root of 660480999 is about 25699.8248826719. The cubic root of 660480999 is about 870.8702258362.

The spelling of 660480999 in words is "six hundred sixty million, four hundred eighty thousand, nine hundred ninety-nine".