660505515 has 8 divisors (see below), whose sum is σ = 1056808848. Its totient is φ = 352269600.

The previous prime is 660505511. The next prime is 660505589. The reversal of 660505515 is 515505066.

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

It is not a de Polignac number, because 660505515 - 2² = 660505511 is a prime.

It is a super-3 number, since 3×660505515³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (660505511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22016836 + ... + 22016865.

It is an arithmetic number, because the mean of its divisors is an integer number (132101106).

Almost surely, 2^660505515 is an apocalyptic number.

660505515 is a deficient number, since it is larger than the sum of its proper divisors (396303333).

660505515 is a wasteful number, since it uses less digits than its factorization.

660505515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44033709.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 660505515 is about 25700.3018464764. The cubic root of 660505515 is about 870.8810008069.

The spelling of 660505515 in words is "six hundred sixty million, five hundred five thousand, five hundred fifteen".