66499965 has 48 divisors (see below), whose sum is σ = 133031808. Its totient is φ = 30100608.

The previous prime is 66499957. The next prime is 66499967. The reversal of 66499965 is 56999466.

It is a happy number.

66499965 is a `hidden beast` number, since 66 + 499 + 96 + 5 = 666.

It is not a de Polignac number, because 66499965 - 2³ = 66499957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66499967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32719 + ... + 34691.

It is an arithmetic number, because the mean of its divisors is an integer number (2771496).

Almost surely, 2^66499965 is an apocalyptic number.

It is an amenable number.

66499965 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

66499965 is a wasteful number, since it uses less digits than its factorization.

66499965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2098 (or 2095 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The square root of 66499965 is about 8154.7510691621. The cubic root of 66499965 is about 405.1418798746.

The spelling of 66499965 in words is "sixty-six million, four hundred ninety-nine thousand, nine hundred sixty-five".