66503115 has 48 divisors (see below), whose sum is σ = 133937856. Its totient is φ = 29894400.

The previous prime is 66503077. The next prime is 66503117. The reversal of 66503115 is 51130566.

It is a happy number.

66503115 is a `hidden beast` number, since 6 + 650 + 3 + 1 + 1 + 5 = 666.

It is not a de Polignac number, because 66503115 - 2¹⁴ = 66486731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66503117) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17485 + ... + 20945.

It is an arithmetic number, because the mean of its divisors is an integer number (2790372).

Almost surely, 2^66503115 is an apocalyptic number.

66503115 is an abundant number, since it is smaller than the sum of its proper divisors (67434741).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66503115 is a wasteful number, since it uses less digits than its factorization.

66503115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3540 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 66503115 is about 8154.9442058177. The cubic root of 66503115 is about 405.1482767541.

The spelling of 66503115 in words is "sixty-six million, five hundred three thousand, one hundred fifteen".