66506115 has 16 divisors (see below), whose sum is σ = 114595488. Its totient is φ = 32741376.

The previous prime is 66506113. The next prime is 66506117. The reversal of 66506115 is 51160566.

It is an interprime number because it is at equal distance from previous prime (66506113) and next prime (66506117).

It is not a de Polignac number, because 66506115 - 2¹ = 66506113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66506113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170334 + ... + 170723.

It is an arithmetic number, because the mean of its divisors is an integer number (7162218).

Almost surely, 2^66506115 is an apocalyptic number.

66506115 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66506115 is a deficient number, since it is larger than the sum of its proper divisors (48089373).

66506115 is a wasteful number, since it uses less digits than its factorization.

66506115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341078.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 66506115 is about 8155.1281412373. The cubic root of 66506115 is about 405.1543688324.

The spelling of 66506115 in words is "sixty-six million, five hundred six thousand, one hundred fifteen".