66515 has 8 divisors (see below), whose sum is σ = 81648. Its totient is φ = 52000.

The previous prime is 66509. The next prime is 66523. The reversal of 66515 is 51566.

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

It is not a de Polignac number, because 66515 - 2⁴ = 66499 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 66515.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 390.

It is an arithmetic number, because the mean of its divisors is an integer number (10206).

2⁶⁶⁵¹⁵ is an apocalyptic number.

66515 is a deficient number, since it is larger than the sum of its proper divisors (15133).

66515 is a wasteful number, since it uses less digits than its factorization.

66515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309.

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

The square root of 66515 is about 257.9050212772. The cubic root of 66515 is about 40.5172410463.

The spelling of 66515 in words is "sixty-six thousand, five hundred fifteen".