66715 has 8 divisors (see below), whose sum is σ = 87408. Its totient is φ = 48480.

The previous prime is 66713. The next prime is 66721. The reversal of 66715 is 51766.

66715 = 4² + 5² + ... + 58².

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

It is not a de Polignac number, because 66715 - 2¹ = 66713 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9 and base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 66715.

It is not an unprimeable number, because it can be changed into a prime (66713) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 552 + ... + 661.

It is an arithmetic number, because the mean of its divisors is an integer number (10926).

2⁶⁶⁷¹⁵ is an apocalyptic number.

66715 is a deficient number, since it is larger than the sum of its proper divisors (20693).

66715 is a wasteful number, since it uses less digits than its factorization.

66715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229.

The product of its digits is 1260, while the sum is 25.

The square root of 66715 is about 258.2924698864. The cubic root of 66715 is about 40.5578100399.

The spelling of 66715 in words is "sixty-six thousand, seven hundred fifteen".