660515 has 4 divisors (see below), whose sum is σ = 792624. Its totient is φ = 528408.

The previous prime is 660509. The next prime is 660521. The reversal of 660515 is 515066.

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

It is an interprime number because it is at equal distance from previous prime (660509) and next prime (660521).

It is a cyclic number.

It is not a de Polignac number, because 660515 - 2¹⁴ = 644131 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66047 + ... + 66056.

It is an arithmetic number, because the mean of its divisors is an integer number (198156).

2⁶⁶⁰⁵¹⁵ is an apocalyptic number.

660515 is a deficient number, since it is larger than the sum of its proper divisors (132109).

660515 is a wasteful number, since it uses less digits than its factorization.

660515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132108.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 660515 is about 812.7207392457. The cubic root of 660515 is about 87.0885169466.

It can be divided in two parts, 660 and 515, that multiplied together give a triangular number (339900 = T₈₂₄).

The spelling of 660515 in words is "six hundred sixty thousand, five hundred fifteen".